Information technology (IT) is the use of computers, software, networks and data to store, process, protect and exchange information. This page covers what IT is, its components, how it differs from computer science and information systems, and the calculations IT courses test, including data units, download time, binary and IP subnets, all worked with numbers. FLN Tutors (Freelancer Network) also offers one-to-one IT help. Matched to a verified specialist who knows your course, your university's marking criteria, and your deadline.
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Information technology is the use of computer systems, software and communication networks to create, store, process, retrieve and exchange information. It covers the laptop on a desk, the network that connects it, the database behind a website and the people who keep all of it running.
Data and information are not the same thing, and many first questions on the subject start here:
| Data | Information | |
|---|---|---|
| What it is | Raw facts and figures, without context | Data that has been processed and organised so it means something |
| Example | 38, 41, 39, 44 | "Average marks rose from 38 to 44 over four tests" |
| Useful for a decision? | Not by itself | Yes |
Every IT system follows the same cycle: input → processing → output, with storage holding data between steps and feedback used to correct the next cycle. A supermarket till is a complete example: the barcode scan is input, looking up the price is processing, the receipt is output, the sales record is storage, and the stock report that triggers a re-order is feedback.
Most textbooks list five or six components. The six-part version is:
| Component | What it is | Examples |
|---|---|---|
| Hardware | The physical equipment | Processor, memory, storage drives, keyboards, printers, servers |
| Software | The instructions that run on the hardware | Operating systems, application software, utilities |
| Data | The raw facts the system stores and processes | Student records, sales figures, sensor readings |
| Networks | The links that let devices share data | Local area networks, the internet, Wi-Fi, mobile networks |
| People | Those who use, build and support the system | Users, programmers, network administrators, support staff |
| Procedures | The rules for using the system | Backup schedules, password policies, data-entry instructions |
Software splits into two kinds, a common short question:
An answer that names a component should always give an example of it. "Procedures" is the one students most often leave out, and the one that explains why most data losses come from missing backups rather than broken hardware.
The three are often confused, and the difference is a frequent exam and career question.
| Information technology | Computer science | Information systems | |
|---|---|---|---|
| Central question | How do we run and support technology so an organisation works? | How do computers work, and how do we make them do new things? | How does an organisation use technology to meet its goals? |
| Focus | Networks, systems, support, security, cloud services | Algorithms, programming, data structures, theory | Business processes, data, management decisions |
| Typical tasks | Set up a network, manage servers, secure accounts | Write software, design algorithms, build compilers | Analyse requirements, choose systems, manage IT projects |
| Maths content | Moderate | High: discrete maths, calculus, statistics | Moderate, with business statistics |
| Typical roles | Systems administrator, network engineer, IT support | Software developer, data scientist, researcher | Business analyst, IT manager, systems analyst |
Two related fields students also ask about: cyber security grew out of IT and specialises in protecting systems and data; data science draws on computer science and statistics to extract insight from large data sets.
For algorithms and programming, see computer science help; for the business side, management information systems help.
Data is measured in bits (a single 0 or 1) and bytes (8 bits). Larger units come in two systems, and confusing them is the commonest units error in IT.
| Decimal (SI) unit | Size | Binary (IEC) unit | Size |
|---|---|---|---|
| kilobyte, kB | 1,000 bytes | kibibyte, KiB | 1,024 bytes |
| megabyte, MB | 1,000,000 bytes | mebibyte, MiB | 1,048,576 bytes |
| gigabyte, GB | 10⁹ bytes | gibibyte, GiB | 2³⁰ = 1,073,741,824 bytes |
The problem: a drive sold as 500 GB shows as about 465 GB in Windows. Why?
Nothing is missing. The same number of bytes is being shown in a larger unit, which makes the figure about 6.9% smaller. Space used by formatting and recovery partitions comes on top of that.
Network speeds are quoted in bits per second (Mbps, megabits per second). File sizes are quoted in bytes. Converting between them is the step most answers miss.
The problem: how long does a 2 GB file take to download on a 100 Mbps connection?
The classic error: dividing 2 GB by 100 directly gives 20 seconds, which treats 100 megabits as if it were 100 mega*bytes*, an error of a factor of eight.
Real downloads take longer than the ideal figure, because of protocol overhead, other traffic and the speed of the server at the other end. State the answer as the ideal time and say so.
Computers store everything as binary, so IT courses expect fluent conversion between decimal, binary and hexadecimal.
Decimal to binary, worked for 156: take the largest powers of 2 that fit.
| Place value | 128 | 64 | 32 | 16 | 8 | 4 | 2 | 1 |
|---|---|---|---|---|---|---|---|---|
| Bit | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 0 |
128 + 16 + 8 + 4 = 156, so 156 = 10011100 in binary.
Binary to hexadecimal: split into groups of four bits from the right. 1001 = 9 and 1100 = 12, which is C, so 10011100 = 9C in hexadecimal.
Hexadecimal to decimal: 2F = 2 × 16 + 15 = 47.
Hexadecimal appears everywhere in IT because each hex digit is exactly four bits: colour codes in web pages, MAC addresses on network cards and memory addresses in error messages all use it.
| Network type | Covers | Example |
|---|---|---|
| PAN | A few metres around one person | Bluetooth earphones and a phone |
| LAN | One building or campus | A school or office network |
| MAN | A city | A city-wide network linking council offices |
| WAN | Countries and continents | The internet, a bank's branch network |
IP addresses. Every device on a network has an IP address. An IPv4 address is 32 bits, written as four numbers from 0 to 255, such as 192.168.1.10. The prefix length, such as /24, says how many of the 32 bits identify the network; the rest identify devices on it.
Worked example: how many devices fit on a /24 and a /26 network?
The formula is usable hosts = 2ⁿ − 2, where n is the number of host bits. Forgetting the −2 is the mistake examiners look for.
India's Information Technology Act, 2000 came into force on 17 October 2000 and was substantially amended in 2008. Class 10 and 12 IT, BCA and BBA courses often ask for its aims and its main offences.
Its aims: to give legal recognition to electronic records and digital signatures, to support e-commerce and e-governance, and to define cyber crimes and their penalties.
| Section | Covers |
|---|---|
| 43 | Penalty and compensation for damage to a computer or system without permission |
| 66 | Computer-related offences, such as hacking with dishonest intent |
| 66C | Identity theft, such as misusing someone's password or digital signature |
| 66D | Cheating by personation using a computer resource |
| 66E | Violation of privacy by capturing or sharing private images |
| 66F | Cyber terrorism |
| 67 | Publishing or transmitting obscene material in electronic form |
A point that earns marks: Section 66A, which punished "offensive" online messages, was struck down by the Supreme Court in 2015 in *Shreya Singhal v. Union of India* for violating freedom of speech. Answers that still quote it as current law lose marks.
See computer science help for programming and algorithms, cyber security help for protecting systems and data, cloud computing help for AWS, Azure and Google Cloud, management information systems help for IT in business decisions, and operating system help for processes, memory and scheduling.
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Information technology is the use of computers, software, networks and data to create, store, process, protect and exchange information. It covers hardware, software, networks and databases, and the people and procedures that keep them working, in businesses, schools, hospitals, governments and homes.
Data is raw facts and figures without context, such as a list of test marks. Information is data that has been processed and organised so that it means something, such as the statement that average marks rose from 38 to 44. Information supports decisions; raw data usually does not.
The commonly taught components are hardware, software, data, networks, people and procedures. Hardware is the physical equipment, software the programs, data the stored facts, networks the connections between devices, people the users and support staff, and procedures the rules such as backup and password policies.
Computer science studies how computers work and how to make them do new things, through programming, algorithms and theory, with a heavy maths content. Information technology applies existing technology to run and support organisations, through networks, systems administration, security and user support, and is more hands-on.
Information technology focuses on the technology itself: building, running and securing networks, servers and devices. Information systems focuses on how an organisation uses that technology to meet its goals, combining business processes, data and management decisions. Information systems roles include business analysts and IT managers.
System software runs the computer itself and provides a platform for other programs, such as an operating system, device drivers and utilities. Application software performs a specific task for the user, such as a word processor, spreadsheet, web browser or accounting package, and runs on top of system software.
Manufacturers measure a gigabyte as one billion bytes, while Windows divides by two to the power thirty and still labels the result gigabytes. 500 billion bytes divided by 1,073,741,824 gives about 465.66 binary gigabytes. No space is missing; the same bytes are shown in a larger unit.
A bit is a single binary digit, either 0 or 1, and is the smallest unit of data. A byte is a group of eight bits, enough to store one character of plain English text. Network speeds are quoted in bits per second, while file sizes are quoted in bytes.
Convert the file size to bits by multiplying the number of bytes by eight, then divide by the connection speed in bits per second. A two gigabyte file is sixteen billion bits, so on a 100 megabit per second connection it takes 160 seconds in ideal conditions.
Write the place values 128, 64, 32, 16, 8, 4, 2 and 1, then put a 1 under each value you use and a 0 under the rest, working from the largest. For 156, the values 128, 16, 8 and 4 are used, giving the binary number 10011100.
Each hexadecimal digit represents exactly four binary bits, so long binary numbers can be written compactly and converted easily. Hexadecimal is used for web colour codes, network card MAC addresses, memory addresses and error codes. The binary number 10011100, for example, is 9C in hexadecimal.
A /24 network uses 24 of the 32 bits for the network, leaving 8 bits for hosts. That gives 256 addresses, but the network address and the broadcast address are reserved, leaving 254 usable host addresses. The general formula is two to the power of host bits, minus two.
Networks are classified by the area they cover. A personal area network spans a few metres, a local area network covers a building or campus, a metropolitan area network covers a city, and a wide area network spans countries or continents. The internet is the largest wide area network.
The Information Technology Act, 2000 is the Indian law that gives legal recognition to electronic records and digital signatures and defines cyber crimes and penalties. It came into force on 17 October 2000 and was amended in 2008. Section 66A was struck down by the Supreme Court in 2015.
Yes. A one-to-one tutor can work through IT concepts, number systems, networking and subnet questions, data calculations and the IT Act with you, and check where your working goes wrong. You complete your own assessed work in line with your school, college or university's academic rules.
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