Computer Full Forms – 120+ Important Computer Abbreviations for Competitive Exams

▣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
E-mail	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
PDF	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.
PDF	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.

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.