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The following outline is provided as an overview of and topical guide to information technology:

Information technology (IT) – microelectronics based combination of computing and telecommunications technology to treat information, including in the acquisition, processing, storage and dissemination of vocal, pictorial, textual and numerical information. It is defined by the Information Technology Association of America (ITAA) as "the study, design, development, implementation, support or management of computer-based information systems, particularly toward software applications and computer hardware."

There are different names for this at different periods or through fields. Some of these names are:

• ICT^[1] – Information and communication technologies
• IT^[2] – Information technology
• DCT^[3] – Data Communication & technology
• CDT^[4] – Creative digital technology
• DT – Design & technology^[5]
• Communication technology
• ^[6] Hacker

• MOSFET (MOS transistor)
  • Semiconductor device fabrication
  • PMOS (p-type MOS)
  • NMOS (n-type MOS)
  • CMOS (complementary MOS)
  • Floating-gate MOSFET (FGMOS)
  • Silicon-gate transistor (SGT)
  • Power MOSFET
  • Multi-gate field-effect transistor (MuGFET)
    • FinFET (fin field-effect transistor)
  • Thin-film transistor (TFT)
• Integrated circuit (IC)
  • Hybrid integrated circuit (HIC)
  • Monolithic integrated circuit (IC) chip
    • Planar process
    • MOS integrated circuit (MOS IC)
    • Silicon-gate technology (SGT) MOS IC
  • Three-dimensional integrated circuit (3D IC)
• Computer memory
  • Semiconductor memory
  • Random-access memory (RAM)
    • Static random-access memory (SRAM)
    • Dynamic random-access memory (DRAM)
    • Synchronous DRAM (SDRAM)
  • Nonvolatile memory (NVM)
    • Read-only memory (ROM)
    • Programmable ROM (PROM)
    • Floating-gate memory
    • EPROM (erasable PROM)
    • EEPROM (electrically erasable PROM)
    • Flash memory
  • Magnetic-core memory
• Microprocessor
  • Central processing unit (CPU)
  • Graphics processing unit (GPU)
  • Digital signal processor (DSP)
  • Image signal processor (ISP)

• History of computing
  • History of computing, by subject
    • History of computing hardware
    • History of computing hardware (1960s–present)
    • History of computer hardware in Eastern Bloc countries
    • History of artificial intelligence
    • History of computer science
    • History of operating systems
    • History of programming languages
    • History of software engineering
    • History of the graphical user interface
    • History of the Internet
    • History of personal computers
    • History of laptops
    • History of video games
    • History of the World Wide Web
  • Timeline of computing
    • Timeline of computing hardware 2400 BC–1949
    • Timeline of computing 1950–1979
    • Timeline of computing 1980–1989
    • Timeline of computing 1990–1999
    • Timeline of computing 2000–2009

• BSIT or B.Sc IT^[7] – Bachelor of Science in Information Technology
• M.Sc. IT, MSc IT or MSIT^[8] – Master of Science in Information Technology
• BCA^[9] – Bachelor of Computer Applications
• MCA^[10] – Master of Computer Applications

• Amazon Web Services has 5 certifications ^[11]
• Apple Inc. – sponsors the Apple certification program^[12]
• Avaya Professional Credential Program
• Cisco Systems – sponsors the Cisco Career Certifications program
• Citrix Systems – sponsors the Citrix Certified Administrator program
• Hewlett-Packard – sponsors the HP-CP certifications related to HP Technologies
• Dell – sponsors the Dell Certified Systems Expert program with Associate and Master levels
• Huawei – sponsors certifications
• IBM – sponsors certifications
• Juniper Networks – sponsors the Juniper Networks Technical Certification Program
• LANDesk – sponsors the Certified LANDesk Administrator and Certified LANDesk Engineer program
• Microsoft Corporation – sponsors the Microsoft Certified Professional program
• MySQL (as part of Oracle Corporation now) – sponsors a certification program
• NetApp – sponsors the NetApp Certification program
• Nortel – sponsors the Nortel Certifications program
• Novell – sponsors a certification program
• Object Management Group – sponsors the Certified Professional program for the Unified Modeling Language
• Oracle Corporation – sponsors the Oracle Certification Program^[13]
• Red Hat – sponsors the Red Hat Certification Program
• SAP – sponsors individual training and certifications
• SolarWinds – sponsors the SolarWinds Certified Professional Program for network management ^[14]
• Sun Microsystems – sponsors the Sun Certified Professional program
• Sybase – sponsors the Certified Sybase Professional program
• VMware – sponsors certification programs (VCP & VCDX)
• Zend Technologies – sponsors the Zend Certified Engineer program

Third-party commercial organizations and vendor neutral interest groups that sponsor certifications include:

• XML Certification Program - XML Master
• Certiport – sponsors the Microsoft Office Specialist and IC3 certification (Internet and Computing Core).
• CompTIA (Computing Technology Industry Association) – offers 12 professional IT Certifications, validating foundation-level IT knowledge and skills.
• European Computer Driving License-Foundation – sponsors the European Computer Driving License (also called International Computer Driving License) (ICDL)
• International Information and Communication Technology Council Certification Program
• (ISC)² – sponsors the CISSP, SSCP and other security certifications
• Linux Professional Institute
• Majinate sponsors the Accredited Symbian Developer scheme for Symbian OS
• NACSE (National Association of Communication Systems Engineers) sponsors 36 Vendor Neutral, knowledge specific, Certifications covering the 5 major IT Disciplines which are: Data Networking, Telecomm, Web Design & Development, Programming & Business Skills for IT Professionals.
• The Open Group – sponsors TOGAF certification and the IT Architect Certification (ITAC) and IT Specialist Certification (ITSC) skills and experience based IT certifications.
• Planet3 Wireless – sponsors the Certified Wireless Network Administrator (CWNA) certification
• SAGE (organization) – sponsors the cSAGE program
• SANS Institute – operates the Global Information Assurance Certification program

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General certification of software practitioners has struggled. The ACM had a professional certification program in the early 1980s, which was discontinued due to lack of interest. Today, the IEEE is certifying software professionals, but only about 500 people have passed the exam by March 2005^[update].

• The IEEE Computer Society – sponsors the Certified Software Development Professional as well as membership designations, "Senior" and "Fellow" which reflect experience and peer review qualification.
• The IET – sponsors the Chartered Engineer and Incorporated Engineer, which can be ratified into the European Engineer
• The BCS – sponsors the Chartered IT Professional (CITP) programme.
• The Institute for Certification of Computing Professionals sponsors the Certified Computing Professional (CCP) and Associate Computing Professional (ACP) certifications
• The BDPA IT Institute – sponsors the BDPA IT Associate (BITA), the BDPA IT Professional (BITP), and the BDPA IT Master (BITM) certifications
• The Canadian Information Processing Society – sponsors the Information Systems Professional certification in Canada.
• The American Institute of Certified Public Accountants – sponsors the Certified Information Technology Professional program.
• APICS – establishes operations management standards and sponsors certification for Logistics

• E democracy
• ^[15]

• British Computer Society
• National Software Testing Laboratories
• American Society for Quality § Certifications
• ISTQB
• CSTE

• Surveillance, Transparency and Democracy: Public Administration in the Information Age. p. 35-57. University of Alabama Press, Tuscaloosa, AL. ISBN 978-0-8173-1877-2

Information and communications technology (ICT) is an extensional term for information technology (IT) that stresses the role of unified communications^[1] and the integration of telecommunications (telephone lines and wireless signals) and computers, as well as necessary enterprise software, middleware, storage and audiovisual, that enable users to access, store, transmit, understand and manipulate information.

ICT is also used to refer to the convergence of audiovisuals and telephone networks with computer networks through a single cabling or link system. There are large economic incentives to merge the telephone networks with the computer network system using a single unified system of cabling, signal distribution, and management. ICT is an umbrella term that includes any communication device, encompassing radio, television, cell phones, computer and network hardware, satellite systems and so on, as well as the various services and appliances with them such as video conferencing and distance learning. ICT also includes analog technology, such as paper communication, and any mode that transmits communication.^[2]

ICT is a broad subject and the concepts are evolving.^[3] It covers any product that will store, retrieve, manipulate, process, transmit, or receive information electronically in a digital form (e.g., personal computers including smartphones, digital television, email, or robots). Skills Framework for the Information Age is one of many models for describing and managing competencies for ICT professionals in the 21st century.^[4]

The phrase "information and communication technologies" has been used by academic researchers since the 1980s.^[5] The abbreviation "ICT" became popular after it was used in a report to the UK government by Dennis Stevenson in 1997,^[6] and then in the revised National Curriculum for England, Wales and Northern Ireland in 2000. However, in 2012, the Royal Society recommended that the use of the term "ICT" should be discontinued in British schools "as it has attracted too many negative connotations".^[7] From 2014, the National Curriculum has used the word computing, which reflects the addition of computer programming into the curriculum.^[8]

Variations of the phrase have spread worldwide. The United Nations has created a "United Nations Information and Communication Technologies Task Force" and an internal "Office of Information and Communications Technology".^[9]

The money spent on IT worldwide has been estimated as US$3.8 trillion^[10] in 2017 and has been growing at less than 5% per year since 2009. The estimated 2018 growth of the entire ICT is 5%. The biggest growth of 16% is expected in the area of new technologies (IoT, Robotics, AR/VR, and AI).^[11]

The 2014 IT budget of the US federal government was nearly $82 billion.^[12] IT costs, as a percentage of corporate revenue, have grown 50% since 2002, putting a strain on IT budgets. When looking at current companies' IT budgets, 75% are recurrent costs, used to "keep the lights on" in the IT department, and 25% are the cost of new initiatives for technology development.^[13]

The average IT budget has the following breakdown:^[13]

• 34% personnel costs (internal), 31% after correction
• 16% software costs (external/purchasing category), 29% after correction
• 33% hardware costs (external/purchasing category), 26% after correction
• 17% costs of external service providers (external/services), 14% after correction

The estimated amount of money spent in 2022 is just over US$6 trillion.^[14]

The world's technological capacity to store information grew from 2.6 (optimally compressed) exabytes in 1986 to 15.8 in 1993, over 54.5 in 2000, and to 295 (optimally compressed) exabytes in 2007, and some 5 zettabytes in 2014.^[15][16] This is the informational equivalent to 1.25 stacks of CD-ROM from the earth to the moon in 2007, and the equivalent of 4,500 stacks of printed books from the earth to the sun in 2014. The world's technological capacity to receive information through one-way broadcast networks was 432 exabytes of (optimally compressed) information in 1986, 715 (optimally compressed) exabytes in 1993, 1.2 (optimally compressed) zettabytes in 2000, and 1.9 zettabytes in 2007.^[15] The world's effective capacity to exchange information through two-way telecommunication networks was 281 petabytes of (optimally compressed) information in 1986, 471 petabytes in 1993, 2.2 (optimally compressed) exabytes in 2000, 65 (optimally compressed) exabytes in 2007,^[15] and some 100 exabytes in 2014.^[17] The world's technological capacity to compute information with humanly guided general-purpose computers grew from 3.0 × 10^8 MIPS in 1986, to 6.4 x 10^12 MIPS in 2007.^[15]

The following is a list of OECD countries by share of ICT sector in total value added in 2013.^[18]

Rank	Country	ICT sector in %	Relative size
1	South Korea	10.7	10.7
2	Japan	7.02	7.02
3	Ireland	6.99	6.99
4	Sweden	6.82	6.82
5	Hungary	6.09	6.09
6	United States	5.89	5.89
7	India	5.87	5.87
8	Czech Republic	5.74	5.74
9	Finland	5.60	5.6
10	United Kingdom	5.53	5.53
11	Estonia	5.33	5.33
12	Slovakia	4.87	4.87
13	Germany	4.84	4.84
14	Luxembourg	4.54	4.54
15	Switzerland	4.63	4.63
16	France	4.33	4.33
17	Slovenia	4.26	4.26
18	Denmark	4.06	4.06
19	Spain	4.00	4
20	Canada	3.86	3.86
21	Italy	3.72	3.72
22	Belgium	3.72	3.72
23	Austria	3.56	3.56
24	Portugal	3.43	3.43
25	Poland	3.33	3.33
26	Norway	3.32	3.32
27	Greece	3.31	3.31
28	Iceland	2.87	2.87
29	Mexico	2.77	2.77

The ICT Development Index ranks and compares the level of ICT use and access across the various countries around the world.^[19] In 2014 ITU (International Telecommunication Union) released the latest rankings of the IDI, with Denmark attaining the top spot, followed by South Korea. The top 30 countries in the rankings include most high-income countries where the quality of life is higher than average, which includes countries from Europe and other regions such as "Australia, Bahrain, Canada, Japan, Macao (China), New Zealand, Singapore, and the United States; almost all countries surveyed improved their IDI ranking this year."^[20]

On 21 December 2001, the United Nations General Assembly approved Resolution 56/183, endorsing the holding of the World Summit on the Information Society (WSIS) to discuss the opportunities and challenges facing today's information society.^[21] According to this resolution, the General Assembly related the Summit to the United Nations Millennium Declaration's goal of implementing ICT to achieve Millennium Development Goals. It also emphasized a multi-stakeholder approach to achieve these goals, using all stakeholders including civil society and the private sector, in addition to governments.

To help anchor and expand ICT to every habitable part of the world, "2015 is the deadline for achievements of the UN Millennium Development Goals (MDGs), which global leaders agreed upon in the year 2000."^[22]

There is evidence that, to be effective in education, ICT must be fully integrated into the pedagogy. Specifically, when teaching literacy and math, using ICT in combination with Writing to Learn^[23][24] produces better results than traditional methods alone or ICT alone.^[25] The United Nations Educational, Scientific and Cultural Organisation (UNESCO), a division of the United Nations, has made integrating ICT into education as part of its efforts to ensure equity and access to education. The following, which was taken directly from a UNESCO publication on educational ICT, explains the organization's position on the initiative.

Information and Communication Technology can contribute to universal access to education, equity in education, the delivery of quality learning and teaching, teachers' professional development and more efficient education management, governance, and administration. UNESCO takes a holistic and comprehensive approach to promote ICT in education. Access, inclusion, and quality are among the main challenges they can address. The Organization's Intersectoral Platform for ICT in education focuses on these issues through the joint work of three of its sectors: Communication & Information, Education and Science.^[26]

Despite the power of computers to enhance and reform teaching and learning practices, improper implementation is a widespread issue beyond the reach of increased funding and technological advances with little evidence that teachers and tutors are properly integrating ICT into everyday learning.^[27] Intrinsic barriers such as a belief in more traditional teaching practices and individual attitudes towards computers in education as well as the teachers own comfort with computers and their ability to use them all as result in varying effectiveness in the integration of ICT in the classroom.^[28]

School environments play an important role in facilitating language learning. However, language and literacy barriers are obstacles preventing refugees from accessing and attending school, especially outside camp settings.^[29]

Mobile-assisted language learning apps are key tools for language learning. Mobile solutions can provide support for refugees' language and literacy challenges in three main areas: literacy development, foreign language learning and translations. Mobile technology is relevant because communicative practice is a key asset for refugees and immigrants as they immerse themselves in a new language and a new society. Well-designed mobile language learning activities connect refugees with mainstream cultures, helping them learn in authentic contexts.^[29]

ICT has been employed as an educational enhancement in Sub-Saharan Africa since the 1960s. Beginning with television and radio, it extended the reach of education from the classroom to the living room, and to geographical areas that had been beyond the reach of the traditional classroom. As the technology evolved and became more widely used, efforts in Sub-Saharan Africa were also expanded. In the 1990s a massive effort to push computer hardware and software into schools was undertaken, with the goal of familiarizing both students and teachers with computers in the classroom. Since then, multiple projects have endeavoured to continue the expansion of ICT's reach in the region, including the One Laptop Per Child (OLPC) project, which by 2015 had distributed over 2.4 million laptops to nearly two million students and teachers.^[30]

The inclusion of ICT in the classroom, often referred to as M-Learning, has expanded the reach of educators and improved their ability to track student progress in Sub-Saharan Africa. In particular, the mobile phone has been most important in this effort. Mobile phone use is widespread, and mobile networks cover a wider area than internet networks in the region. The devices are familiar to student, teacher, and parent, and allow increased communication and access to educational materials. In addition to benefits for students, M-learning also offers the opportunity for better teacher training, which leads to a more consistent curriculum across the educational service area. In 2011, UNESCO started a yearly symposium called Mobile Learning Week with the purpose of gathering stakeholders to discuss the M-learning initiative.^[30]

Implementation is not without its challenges. While mobile phone and internet use are increasing much more rapidly in Sub-Saharan Africa than in other developing countries, the progress is still slow compared to the rest of the developed world, with smartphone penetration only expected to reach 20% by 2017.^[30] Additionally, there are gender, social, and geo-political barriers to educational access, and the severity of these barriers vary greatly by country. Overall, 29.6 million children in Sub-Saharan Africa were not in school in the year 2012, owing not just to the geographical divide, but also to political instability, the importance of social origins, social structure, and gender inequality. Once in school, students also face barriers to quality education, such as teacher competency, training and preparedness, access to educational materials, and lack of information management.^[30]

In modern society, ICT is ever-present, with over three billion people having access to the Internet.^[31] With approximately 8 out of 10 Internet users owning a smartphone, information and data are increasing by leaps and bounds.^[32] This rapid growth, especially in developing countries, has led ICT to become a keystone of everyday life, in which life without some facet of technology renders most of clerical, work and routine tasks dysfunctional.

The most recent authoritative data, released in 2014, shows "that Internet use continues to grow steadily, at 6.6% globally in 2014 (3.3% in developed countries, 8.7% in the developing world); the number of Internet users in developing countries has doubled in five years (2009–2014), with two-thirds of all people online now living in the developing world."^[20]

However, hurdles are still large. "Of the 4.3 billion people not yet using the Internet, 90% live in developing countries. In the world's 42 Least Connected Countries (LCCs), which are home to 2.5 billion people, access to ICTs remains largely out of reach, particularly for these countries' large rural populations."^[33] ICT has yet to penetrate the remote areas of some countries, with many developing countries dearth of any type of Internet. This also includes the availability of telephone lines, particularly the availability of cellular coverage, and other forms of electronic transmission of data. The latest "Measuring the Information Society Report" cautiously stated that the increase in the aforementioned cellular data coverage is ostensible, as "many users have multiple subscriptions, with global growth figures sometimes translating into little real improvement in the level of connectivity of those at the very bottom of the pyramid; an estimated 450 million people worldwide live in places which are still out of reach of mobile cellular service."^[31]

Favourably, the gap between the access to the Internet and mobile coverage has decreased substantially in the last fifteen years, in which "2015 was the deadline for achievements of the UN Millennium Development Goals (MDGs), which global leaders agreed upon in the year 2000, and the new data show ICT progress and highlight remaining gaps."^[22] ICT continues to take on a new form, with nanotechnology set to usher in a new wave of ICT electronics and gadgets. ICT newest editions into the modern electronic world include smartwatches, such as the Apple Watch, smart wristbands such as the Nike+ FuelBand, and smart TVs such as Google TV. With desktops soon becoming part of a bygone era, and laptops becoming the preferred method of computing, ICT continues to insinuate and alter itself in the ever-changing globe.

Information communication technologies play a role in facilitating accelerated pluralism in new social movements today. The internet according to Bruce Bimber is "accelerating the process of issue group formation and action"^[34] and coined the term accelerated pluralism to explain this new phenomena. ICTs are tools for "enabling social movement leaders and empowering dictators"^[35] in effect promoting societal change. ICTs can be used to garner grassroots support for a cause due to the internet allowing for political discourse and direct interventions with state policy^[36] as well as change the way complaints from the populace are handled by governments. Furthermore, ICTs in a household are associated with women rejecting justifications for intimate partner violence. According to a study published in 2017, this is likely because "access to ICTs exposes women to different ways of life and different notions about women's role in society and the household, especially in culturally conservative regions where traditional gender expectations contrast observed alternatives."^[37]

• Telehealth
  • A review found that in general, outcomes of such ICT-use – which were envisioned as early as 1925^[38] – are or can be as good as in-person care with health care use staying similar.^[39]
• Artificial intelligence in healthcare
• Software for COVID-19 pandemic mitigation
• mHealth
• Clinical decision support system and expert system
• Health administration and hospital information system
• Other health information technology and health informatics

Applications of ICTs in science, research and development, and academia include:

• Internet research
• Online research methods
• Science communication and communication between scientists
• Scholarly databases
• Applied metascience

Scholar Mark Warschauer defines a "models of access" framework for analyzing ICT accessibility. In the second chapter of his book, Technology and Social Inclusion: Rethinking the Digital Divide, he describes three models of access to ICTs: devices, conduits, and literacy.^[40] Devices and conduits are the most common descriptors for access to ICTs, but they are insufficient for meaningful access to ICTs without third model of access, literacy.^[40] Combined, these three models roughly incorporate all twelve of the criteria of "Real Access" to ICT use, conceptualized by a non-profit organization called Bridges.org in 2005:^[41]

1. Physical access to technology
2. Appropriateness of technology
3. Affordability of technology and technology use
4. Human capacity and training
5. Locally relevant content, applications, and services
6. Integration into daily routines
7. Socio-cultural factors
8. Trust in technology
9. Local economic environment
10. Macro-economic environment
11. Legal and regulatory framework
12. Political will and public support

The most straightforward model of access for ICT in Mark Warschauer's theory is devices.^[40] In this model, access is defined most simply as the ownership of a device such as a phone or computer.^[40] Warschauer identifies many flaws with this model, including its inability to account for additional costs of ownership such as software, access to telecommunications, knowledge gaps surrounding computer use, and the role of government regulation in some countries.^[40] Therefore, Warschauer argues that considering only devices understates the magnitude of digital inequality. For example, the Pew Research Center notes that 96% of Americans own a smartphone,^[42] although most scholars in this field would contend that comprehensive access to ICT in the United States is likely much lower than that.

A conduit requires a connection to a supply line, which for ICT could be a telephone line or Internet line. Accessing the supply requires investment in the proper infrastructure from a commercial company or local government and recurring payments from the user once the line is set up. For this reason, conduits usually divide people based on their geographic locations. As a Pew Research Center poll reports, Americans in rural areas are 12% less likely to have broadband access than other Americans, thereby making them less likely to own the devices.^[43] Additionally, these costs can be prohibitive to lower-income families accessing ICTs. These difficulties have led to a shift toward mobile technology; fewer people are purchasing broadband connection and are instead relying on their smartphones for Internet access, which can be found for free at public places such as libraries.^[44] Indeed, smartphones are on the rise, with 37% of Americans using smartphones as their primary medium for internet access^[44] and 96% of Americans owning a smartphone.^[42]

In 1981, Sylvia Scribner and Michael Cole studied a tribe in Liberia, the Vai people, who have their own local script. Since about half of those literate in Vai have never had formal schooling, Scribner and Cole were able to test more than 1,000 subjects to measure the mental capabilities of literates over non-literates.^[45] This research, which they laid out in their book The Psychology of Literacy,^[45] allowed them to study whether the literacy divide exists at the individual level. Warschauer applied their literacy research to ICT literacy as part of his model of ICT access.

Scribner and Cole found no generalizable cognitive benefits from Vai literacy; instead, individual differences on cognitive tasks were due to other factors, like schooling or living environment.^[45] The results suggested that there is "no single construct of literacy that divides people into two cognitive camps; [...] rather, there are gradations and types of literacies, with a range of benefits closely related to the specific functions of literacy practices."^[40] Furthermore, literacy and social development are intertwined, and the literacy divide does not exist on the individual level.

Warschauer draws on Scribner and Cole's research to argue that ICT literacy functions similarly to literacy acquisition, as they both require resources rather than a narrow cognitive skill. Conclusions about literacy serve as the basis for a theory of the digital divide and ICT access, as detailed below:

There is not just one type of ICT access, but many types. The meaning and value of access varies in particular social contexts. Access exists in gradations rather than in a bipolar opposition. Computer and Internet use brings no automatic benefit outside of its particular functions. ICT use is a social practice, involving access to physical artifacts, content, skills, and social support. And acquisition of ICT access is a matter not only of education but also of power.^[40]

Therefore, Warschauer concludes that access to ICT cannot rest on devices or conduits alone; it must also engage physical, digital, human, and social resources.^[40] Each of these categories of resources have iterative relations with ICT use. If ICT is used well, it can promote these resources, but if it is used poorly, it can contribute to a cycle of underdevelopment and exclusion.^[45]