Definition

information technology (IT)

Information technology (IT) is the use of any computers, storage, networking and other physical devices, infrastructure and processes to create, process, store, secure and exchange all forms of electronic data. Typically, IT is used in the context of business operations, as opposed to technology used for personal or entertainment purposes. The commercial use of IT encompasses both computer technology and telecommunications.

The Harvard Business Review coined the term information technology to make a distinction between purpose-built machines designed to perform a limited scope of functions, and general-purpose computing machines that could be programmed for various tasks. As the IT industry evolved from the mid-20th century, computing capability increased, while device cost and energy consumption decreased, a cycle that continues today when new technologies emerge.

What does information technology encompass?

The term information technology has grown to embrace an array of technologies and related disciplines. IT still comprises basic computer-based information systems, including computing hardware, operating systems (OSes), application software and the data that is processed to produce useful information. Over time, each of these IT components and functions has become more complex, embracing ever-growing subsets of technologies and methodologies.

For example, application development began as a relatively linear process where systems analysts and programmers created code to achieve a business purpose. It has evolved into a more cooperative and organic process that embodies application creation processes, such as DevOps and agile software development.

Even operating systems -- the basic code that makes servers and client computers work -- have taken on new dimensions. Technologies such as virtualization and containerization have broken, or at least changed, the bond between OSes and host hardware. As a result, IT no longer just happens locally; cloud computing environments now complement and even replace on-premises resources of the traditional data center.

All these developments have made IT more complex and required greater specialization and new roles and responsibilities from the IT workforce.

IT components and functions
IT encompasses many different technologies, capabilities and functions.

Why is information technology important?

It's been said that data is what powers industries worldwide. That may be hyperbole, but few businesses -- large or small -- can remain competitive without the ability to collect data and turn it into useful information. IT provides the means to develop, process, analyze, exchange, store and secure information.

Data processing plays a significant role in these core business practices, among others, including:

  • product development and design;
  • marketing and market research;
  • sales and invoicing;
  • customer development and retention;
  • accounting and taxes;
  • human resources and payroll; and
  • regulatory compliance.

Computing has penetrated practically every part of business and much of our personal lives, as well. The ubiquity of computing -- also referred to as pervasive computing -- is another reason why IT is critical. Computing devices have evolved well beyond personal computers (PCs) and servers. Today, all businesses and most individuals have and use multiple computing devices, including phones, tablets, laptops, game consoles and even doorbells, thermostats, vacuums and many kitchen appliances.

Virtually all of these devices, many of which are part of the internet of things (IoT), tap into the internet, which interconnects billions of devices worldwide. It's a complex and, potentially, perilous environment that requires IT expertise for management, security, maintenance and reliability.

IT software and hardware

IT includes several layers of physical equipment (hardware), virtualization, management systems, automation tools, operating systems, other system software and applications used to perform essential functions. As noted above, user devices, peripherals and software can be included in the IT domain. IT can also refer to the architectures, methodologies and regulations governing the use and storage of data.

Software

There are two categories of software: system software and applications. System software encompasses the computer programs that manage the basic computing functions. They include the following:

Business applications include:

  • databases, such as SQL Server;
  • transactional systems, such as real-time order entry;
  • email servers, like Microsoft Exchange
  • web servers, like Apache and Microsoft's Internet Information Services (IIS);
  • customer relationship management (CRM), such as Oracle NetSuite and HubSpot; and
  • enterprise resource planning (ERP) systems, like SAP S/4HANA.

These applications make use of programmed instructions to manipulate, consolidate, disperse and otherwise work with data for a business purpose.

Mobile applications that run on smartphones, tablets and other portable devices typically connect with cloud or data center applications over the internet. These applications have expanded the scope of computing and created a new category of software and telecommunications that requires special expertise to maintain.

Hardware

There are many different types of computer hardware. Computer servers run business applications. Servers interact with client devices in the client-server model. They also communicate with other servers across computer networks, which typically link to the internet.

Storage is another type of hardware. It's any technology that holds information as data. Storage may be local on a specific server or shared among many servers, and it may be installed on premises or accessed via a cloud service. Information that is stored can take many forms, including file, multimedia, telephony, and web and sensors data. Storage hardware includes volatile random-access memory (RAM) as well as non-volatile tape, hard disk drives and solid-state drives.

Telecom equipment, comprising network interface cards (NICs), cabling, wireless communications and switching devices, connect the hardware elements together and to external networks.

Abstracting hardware and software

IT architectures have evolved to include virtualization and cloud computing, where physical resources are abstracted and pooled in different configurations to meet application requirements. Clouds may be distributed across locations and shared with other IT users, or they can be contained within a corporate data center, or some combination of both deployments.

Volatility is a characteristic of virtualized resources, enabling them to expand and contract as needed. Subscription-based cloud or locally installed resources, such as storage or composable architectures, can spin up resources, such as servers, OSes and application software, as needed and then release them when processing is complete.

Information technology vs. computer science

When researching careers in IT, you're likely to come across the term computer science. While there is overlap between IT and computer science, the two are distinct disciplines with different courses of study to prepare for careers in either area.

Information technology

IT is generally associated with the application of technology to deal with business issues. As such, the IT workforce is oriented toward developed technologies such as hardware systems, OSes and application software. Proficiency in IT is required to identify the hardware and software components that should be used to enhance a specific business process. IT pros work with a variety of technologies, such as server OSes, communications devices and software, and applications.

Preparation for an IT career requires basic courses in hardware and software systems. IT degree programs may include subjects such as:

  • business analysis
  • project management
  • telecommunications
  • network administration
  • database design
  • database management
information technology vs. computer science
Find out how IT and computer science differ.

Computer science

Computer science focuses on the logic and design of the underpinnings of the components that IT experts use to assemble business systems. A strong mathematics background is required to pursue a computer science career. Much of the work in computer science involves developing the algorithms and logic and writing the low-level code that enables computer systems to address business problems.

Computer scientists may participate in the hardware and software engineering work required to develop products. They are also likely to delve into more abstract technologies, such as artificial intelligence (AI) and machine learning (ML).

A course of study in computer science requires a foundation in computer concepts and advanced mathematics. It may be complemented with subjects such as:

  • AI and ML
  • neural networks
  • security systems
  • data analytics
  • user experience

IT education and job functions

A team of administrators and other technical staffers deploy and manage a company's IT infrastructure and assets. IT teams depend on a range of specialized information and technology skills and knowledge to support equipment, applications and activities. Third-party contractors and IT vendor support personnel augment the IT team.

The information technology profession is extremely diverse. IT workers can specialize in fields such as software development; application management; hardware components; server, storage or network administration; network architecture; and more. Many businesses seek IT professionals with mixed or overlapping skill sets.

Careers in information technology

There is a wide array of IT careers, each with varying technological and managerial requisites. Among the most common IT job titles are the following:

  • Chief information officer (CIO). This person is responsible for IT and computer systems that support the goals of the business.
  • Chief technology officer (CTO). This person sets the technology goals and policies within an organization.
  • IT director. This person is responsible for the function of the business's technology tools and processes. This role may also be called IT manager or IT leader.
  • System administrator (sys admin). This person configures, manages, supports and troubleshoots a multiuser computing environment. Within a business, this role can be divided up by technology, requiring an administrator or team dedicated to server, desktop, network administration, virtualization, or other components and technologies.
  • Application manager. This person's role centers on the provisioning and management of a high-value business application, such as Exchange.
  • Developer or software engineer. This person or team writes, updates and tests code for computer programs to meet internal or customer-facing business objectives.
  • Chief IT architect or IT architect. This person examines and changes IT functions to best support the business.

IT skills and certifications

A successful IT career will involve developing several technical skills. For the current IT job market, these 10 skills are among those most in demand:

  1. cybersecurity
  2. cloud computing
  3. edge computing and IoT
  4. IT automation
  5. software development
  6. big data management and data analytics
  7. DevOps
  8. AI
  9. ML
  10. mobile application development

In the pursuit of these IT disciplines, it is advantageous to earn certification to demonstrate proficiency in specific technologies and areas of expertise. Some of the most highly regarded certifications include the following:

This was last updated in February 2021

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