Published: 15 September, 2026|Updated: 15 September, 2026
Computer full forms and abbreviations are frequently asked in SSC, Banking, Railway, UPSC, State PSC and other competitive exams. This page covers more than 120 important computer-related abbreviations with simple explanations for quick revision.
Important note: The word “COMPUTER” itself does not have a universally accepted official full form. Popular expansions such as “Common Operating Machine Purposely Used for Technological and Educational Research” are backronyms, not standard technical definitions.
Computer Full Forms – Most Important Abbreviations
| Abbreviation | Full Form | What It Means |
|---|---|---|
| CPU | Central Processing Unit | Main processing unit that executes instructions. |
| ALU | Arithmetic Logic Unit | Performs arithmetic and logical operations. |
| CU | Control Unit | Controls and coordinates computer operations. |
| RAM | Random Access Memory | Temporary working memory used by active programs. |
| ROM | Read-Only Memory | Non-volatile memory used to store persistent instructions. |
| BIOS | Basic Input/Output System | Firmware traditionally used to initialize hardware during startup. |
| UEFI | Unified Extensible Firmware Interface | Modern firmware interface used to initialize and boot computers. |
| HDD | Hard Disk Drive | Magnetic storage device for persistent data. |
| SSD | Solid-State Drive | Storage device using flash memory instead of spinning disks. |
| USB | Universal Serial Bus | Standard interface for connecting peripherals and transferring data. |
| GPU | Graphics Processing Unit | Processor specialized for graphics and parallel workloads. |
| PSU | Power Supply Unit | Converts electrical power into usable power for computer components. |
Hardware and CPU Related Full Forms
| Abbreviation | Full Form | Exam Point |
|---|---|---|
| PCB | Printed Circuit Board | Board that mechanically supports and electrically connects components. |
| IC | Integrated Circuit | Electronic circuit containing components fabricated on a semiconductor. |
| VLSI | Very Large-Scale Integration | Technology involving a very large number of components on an integrated circuit. |
| CMOS | Complementary Metal-Oxide-Semiconductor | A semiconductor technology used in many electronic circuits. |
| SMPS | Switched-Mode Power Supply | Efficient power supply technology used in computers and electronics. |
| LCD | Liquid Crystal Display | Display technology based on liquid crystals. |
| LED | Light-Emitting Diode | Semiconductor device that emits light. |
| OLED | Organic Light-Emitting Diode | Display technology using organic light-emitting materials. |
| CRT | Cathode-Ray Tube | Older display technology used in traditional monitors and televisions. |
| DMA | Direct Memory Access | Allows certain hardware devices to access memory with limited CPU involvement. |
| PCI | Peripheral Component Interconnect | Bus standard for connecting peripheral devices. |
| PCIe | Peripheral Component Interconnect Express | High-speed serial expansion interface. |
| HDMI | High-Definition Multimedia Interface | Digital interface commonly used for audio and video. |
| VGA | Video Graphics Array | Display standard and connector associated with analog video. |
| UPS | Uninterruptible Power Supply | Provides backup power during electrical interruptions. |
Computer Memory and Storage Full Forms
| Abbreviation | Full Form | Exam Point |
|---|---|---|
| SRAM | Static Random-Access Memory | Fast volatile memory commonly used for cache. |
| DRAM | Dynamic Random-Access Memory | Common type of main memory that requires periodic refreshing. |
| SDRAM | Synchronous Dynamic Random-Access Memory | DRAM synchronized with the system clock. |
| DDR | Double Data Rate | Memory technology transferring data on both clock edges. |
| SRAM | Static Random-Access Memory | Volatile memory that does not require refresh cycles while powered. |
| EEPROM | Electrically Erasable Programmable Read-Only Memory | Non-volatile memory that can be electrically erased and rewritten. |
| PROM | Programmable Read-Only Memory | Memory that can be programmed after manufacture. |
| EPROM | Erasable Programmable Read-Only Memory | Programmable memory that can traditionally be erased using ultraviolet light. |
| CD | Compact Disc | Optical storage medium. |
| DVD | Digital Versatile Disc | Optical storage medium with higher capacity than a CD. |
| BD | Blu-ray Disc | Optical disc format designed for high-capacity storage. |
| TB | Terabyte | Common decimal unit used to describe large storage capacity. |
| GB | Gigabyte | Common unit used to describe memory and storage capacity. |
| MB | Megabyte | Unit commonly used for file size and memory/storage capacity. |
| KB | Kilobyte | Unit commonly used for digital data size. |
Internet and Networking Full Forms
| Abbreviation | Full Form | Exam Point |
|---|---|---|
| WWW | World Wide Web | System of interlinked web resources accessed over the Internet. |
| HTTP | Hypertext Transfer Protocol | Application-layer protocol used for web communication. |
| HTTPS | Hypertext Transfer Protocol Secure | HTTP communication protected using TLS. |
| URL | Uniform Resource Locator | Address used to locate a resource on a network. |
| URI | Uniform Resource Identifier | Identifier for a resource. |
| IP | Internet Protocol | Protocol responsible for addressing and routing packets. |
| IPv4 | Internet Protocol Version 4 | Internet Protocol version using 32-bit addresses. |
| IPv6 | Internet Protocol Version 6 | Internet Protocol version using 128-bit addresses. |
| TCP | Transmission Control Protocol | Reliable, connection-oriented transport protocol. |
| UDP | User Datagram Protocol | Connectionless transport protocol with low overhead. |
| DNS | Domain Name System | Translates domain names into IP addresses and other DNS records. |
| DHCP | Dynamic Host Configuration Protocol | Automatically provides network configuration such as IP addresses. |
| FTP | File Transfer Protocol | Protocol for transferring files over a network. |
| SFTP | SSH File Transfer Protocol | Secure file transfer protocol operating over SSH. |
| SMTP | Simple Mail Transfer Protocol | Protocol used for sending email. |
| POP3 | Post Office Protocol Version 3 | Email retrieval protocol. |
| IMAP | Internet Message Access Protocol | Protocol for accessing and managing email stored on a server. |
| LAN | Local Area Network | Network covering a relatively small geographic area. |
| MAN | Metropolitan Area Network | Network spanning a city or metropolitan area. |
| WAN | Wide Area Network | Network covering a large geographic area. |
| PAN | Personal Area Network | Network around an individual or personal devices. |
| WLAN | Wireless Local Area Network | LAN using wireless communication. |
| VPN | Virtual Private Network | Creates an encrypted or protected network connection over another network. |
| ISP | Internet Service Provider | Organization that provides Internet access or related services. |
| NIC | Network Interface Card | Hardware interface that connects a computer to a network. |
| MAC | Media Access Control | Link-layer addressing concept; a MAC address identifies a network interface. |
| ARP | Address Resolution Protocol | Used in IPv4 networks to map IP addresses to link-layer addresses. |
| ICMP | Internet Control Message Protocol | Used for network control, diagnostics and error reporting. |
| SSH | Secure Shell | Protocol for secure remote login and command execution. |
| SSL | Secure Sockets Layer | Older security protocol superseded by TLS. |
| TLS | Transport Layer Security | Cryptographic protocol used to secure network communication. |
| VoIP | Voice over Internet Protocol | Voice communication carried over IP networks. |
| ISP | Internet Service Provider | Company or organization providing Internet connectivity. |
Software and Operating System Full Forms
| Abbreviation | Full Form | Exam Point |
|---|---|---|
| OS | Operating System | System software that manages hardware and provides services for applications. |
| GUI | Graphical User Interface | Interface using visual elements such as windows, icons and menus. |
| CLI | Command-Line Interface | Interface in which users interact through text commands. |
| API | Application Programming Interface | Defined interface through which software components communicate. |
| SDK | Software Development Kit | Collection of tools used to develop software for a platform. |
| IDE | Integrated Development Environment | Software application combining tools for software development. |
| DBMS | Database Management System | Software used to create, manage and access databases. |
| RDBMS | Relational Database Management System | Database system based on relational data models. |
| SQL | Structured Query Language | Language widely used to manage and query relational databases. |
| GUI | Graphical User Interface | Visual method of interacting with software. |
| CLI | Command-Line Interface | Text-based method of interacting with a computer. |
| GNU | GNU’s Not Unix | Recursive name of the GNU operating-system project. |
| GPL | GNU General Public License | Free and open-source software license. |
| FOSS | Free and Open Source Software | Software distributed with freedoms to use, study, modify and share under its license. |
Programming and Web Technology Full Forms
| Abbreviation | Full Form | Exam Point |
|---|---|---|
| HTML | HyperText Markup Language | Standard markup language used to structure web pages. |
| CSS | Cascading Style Sheets | Language used to style and present web documents. |
| XML | Extensible Markup Language | Markup language designed to represent structured data. |
| JSON | JavaScript Object Notation | Text format commonly used for structured data exchange. |
| PHP | PHP: Hypertext Preprocessor | Server-side scripting language widely used for web development. |
| SQL | Structured Query Language | Language used to query and manage relational databases. |
| JS | JavaScript | Programming language widely used for interactive web applications. |
| DOM | Document Object Model | Programming interface representing an HTML/XML document as objects. |
| AJAX | Asynchronous JavaScript and XML | Web development technique for asynchronous data exchange. |
| CMS | Content Management System | Software used to create, manage and publish digital content. |
| URL | Uniform Resource Locator | Common web address format for locating resources. |
| WWW | World Wide Web | Web system built on Internet technologies. |
Cyber Security and Authentication Full Forms
| Abbreviation | Full Form | Exam Point |
|---|---|---|
| AI | Artificial Intelligence | Technology concerned with systems performing tasks associated with human intelligence. |
| ML | Machine Learning | Methods that allow systems to learn patterns from data. |
| MFA | Multi-Factor Authentication | Authentication using more than one distinct factor. |
| 2FA | Two-Factor Authentication | Authentication requiring two different factors. |
| OTP | One-Time Password | Password or code intended for a single authentication use. |
| PIN | Personal Identification Number | Numeric code used for authentication or access. |
| AES | Advanced Encryption Standard | Symmetric encryption standard. |
| RSA | Rivest–Shamir–Adleman | Public-key cryptographic algorithm named after its inventors. |
| VPN | Virtual Private Network | Protected network connection over another network. |
| IDS | Intrusion Detection System | System that detects suspicious or malicious activity. |
| IPS | Intrusion Prevention System | System designed to detect and help prevent malicious activity. |
| DoS | Denial of Service | Attack intended to make a service unavailable. |
| DDoS | Distributed Denial of Service | Denial-of-service attack launched from multiple systems. |
| SSL | Secure Sockets Layer | Legacy protocol for securing network communication. |
| TLS | Transport Layer Security | Modern cryptographic protocol for securing network communication. |
| CAPTCHA | Completely Automated Public Turing test to tell Computers and Humans Apart | Challenge designed to distinguish humans from automated systems. |
| URL | Uniform Resource Locator | Resource location identifier commonly used on the web. |
Email and Communication Full Forms
| Abbreviation | Full Form | Use |
|---|---|---|
| Electronic Mail | Digital system for sending and receiving messages. | |
| SMTP | Simple Mail Transfer Protocol | Used for sending email. |
| POP3 | Post Office Protocol Version 3 | Used to retrieve email. |
| IMAP | Internet Message Access Protocol | Used to access and manage email on a mail server. |
| MIME | Multipurpose Internet Mail Extensions | Internet standard for representing content types and email attachments. |
| CC | Carbon Copy | Email field used to send a visible copy to additional recipients. |
| BCC | Blind Carbon Copy | Email field that hides recipients from other recipients. |
| SMS | Short Message Service | Text messaging service. |
| MMS | Multimedia Messaging Service | Messaging service supporting multimedia content. |
File Formats and Digital Media Full Forms
| Abbreviation | Full Form | Type |
|---|---|---|
| Portable Document Format | Document format. | |
| JPEG | Joint Photographic Experts Group | Image compression standard. |
| PNG | Portable Network Graphics | Raster image format. |
| GIF | Graphics Interchange Format | Bitmap image format supporting animation. |
| SVG | Scalable Vector Graphics | XML-based vector graphics format. |
| MP3 | MPEG Audio Layer III | Common compressed digital audio format. |
| MP4 | MPEG-4 Part 14 | Digital multimedia container format. |
| AVI | Audio Video Interleave | Multimedia container format. |
| WAV | Waveform Audio File Format | Digital audio file format. |
| ZIP | ZIP archive format | Compressed archive format; ZIP is a format name rather than a standard expansion. |
| CSV | Comma-Separated Values | Plain-text tabular data format. |
| RTF | Rich Text Format | Document format supporting formatted text. |
Database and Data Full Forms
| Abbreviation | Full Form | Use |
|---|---|---|
| DB | Database | Organized collection of data. |
| DBMS | Database Management System | Software for managing databases. |
| RDBMS | Relational Database Management System | Database system based on relational tables. |
| SQL | Structured Query Language | Language for relational database operations. |
| DDL | Data Definition Language | SQL category used to define database structures. |
| DML | Data Manipulation Language | SQL category used to manipulate data. |
| DCL | Data Control Language | SQL category related to permissions and access control. |
| TCL | Transaction Control Language | SQL category for transaction management. |
| OLTP | Online Transaction Processing | Systems designed for transaction-oriented workloads. |
| OLAP | Online Analytical Processing | Systems designed for multidimensional analysis. |
| ETL | Extract, Transform, Load | Process of preparing and loading data into a target system. |
| CSV | Comma-Separated Values | Simple text-based tabular data format. |
Office and Common Computer Terms
| Abbreviation | Full Form | Meaning |
|---|---|---|
| MS | Microsoft | Technology company; commonly seen in MS Office. |
| MS Office | Microsoft Office | Suite of productivity applications. |
| DOC | Document | Traditional Microsoft Word document file extension. |
| XLS | Excel Spreadsheet | Traditional Microsoft Excel workbook file extension. |
| PPT | PowerPoint Presentation | Traditional Microsoft PowerPoint presentation file extension. |
| OCR | Optical Character Recognition | Technology that converts images of text into machine-readable text. |
| OMR | Optical Mark Recognition | Technology used to detect marked areas on forms and answer sheets. |
| MICR | Magnetic Ink Character Recognition | Technology used to read characters printed with magnetic ink, especially on cheques. |
| QR | Quick Response | Two-dimensional barcode format. |
| Portable Document Format | Portable document file format. | |
| FAQ | Frequently Asked Questions | Commonly asked questions and answers. |
| IT | Information Technology | Use of computing and communication technologies to handle information. |
| ICT | Information and Communication Technology | Technologies used for information processing and communication. |
Top 20 Computer Full Forms for Quick Revision
- CPU – Central Processing Unit
- ALU – Arithmetic Logic Unit
- CU – Control Unit
- RAM – Random Access Memory
- ROM – Read-Only Memory
- BIOS – Basic Input/Output System
- USB – Universal Serial Bus
- HDD – Hard Disk Drive
- SSD – Solid-State Drive
- OS – Operating System
- GUI – Graphical User Interface
- URL – Uniform Resource Locator
- HTTP – Hypertext Transfer Protocol
- HTTPS – Hypertext Transfer Protocol Secure
- HTML – HyperText Markup Language
- CSS – Cascading Style Sheets
- DNS – Domain Name System
- IP – Internet Protocol
- TCP – Transmission Control Protocol
- VPN – Virtual Private Network
Computer Full Forms – Important Exam Tips
- Remember CPU, ALU and CU together as the core processing concepts.
- RAM is volatile memory, while ROM is non-volatile memory.
- HTTP and HTTPS are web communication protocols; HTTPS adds transport security through TLS.
- TCP is connection-oriented, while UDP is connectionless.
- LAN covers a smaller area than WAN.
- DNS is associated with domain-name resolution.
- HTML structures web pages, while CSS controls their presentation.
- DBMS manages databases and RDBMS is a relational form of DBMS.
- MFA uses more than one authentication factor.
- Do not memorize unofficial “full forms” of words that are actually product names, standards or acronyms without expansions.
Related Computer GK Articles
For a complete foundation, first read our Computer Fundamentals – Basics of Computer, Generations, Types & Important Terms.
More Computer GK topics will be added to this series, including computer memory, input and output devices, computer generations, shortcut keys, networking basics, MS Office GK and Computer GK questions.
Frequently Asked Questions
What is the full form of CPU?
CPU stands for Central Processing Unit. It executes instructions and performs the main processing work of a computer.
What is the full form of RAM?
RAM stands for Random Access Memory. It is the computer’s working memory and is generally volatile.
What is the full form of ROM?
ROM stands for Read-Only Memory. It refers to non-volatile memory used to retain data or instructions without continuous power.
What is the full form of URL?
URL stands for Uniform Resource Locator. It is a form of identifier used to locate a resource.
What is the full form of HTTP?
HTTP stands for Hypertext Transfer Protocol, the application-layer protocol used for web communication.
What is the full form of HTML?
HTML stands for HyperText Markup Language. It is the standard markup language used to structure web pages.
Does COMPUTER have an official full form?
No. “Computer” is not an acronym with a universally accepted official expansion. Popular internet expansions are unofficial backronyms and should not be treated as standard technical full forms.
Quick Revision: Bookmark this page and revise these computer full forms before SSC, Banking, Railway, UPSC, State PSC and other competitive examinations.