Important Computer Abbreviations and Full Forms: Quick List of 100 Computer Terms for SSC CGL, CHSL and MTS
Rahul Kumar
SSC Exam Expert & Content Editor
Updated 21 Oct 2026
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PDF Notes: Important Computer Abbreviations and Full Forms: Quick List of 100 Computer Terms for SSC CGL, CHSL and MTS
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Full forms of computer terms are a sure-shot topic in SSC computer awareness. This guide on important computer abbreviations and full forms for SSC gives about 100 terms in category-wise tables for quick revision, with practice questions and FAQs. For a longer list, see Computer Full Forms.
Hardware and Memory
| Abbreviation | Full Form |
|---|---|
| CPU | Central Processing Unit |
| ALU | Arithmetic Logic Unit |
| CU | Control Unit |
| RAM | Random Access Memory |
| ROM | Read Only Memory |
| PROM | Programmable Read Only Memory |
| EPROM | Erasable Programmable Read Only Memory |
| EEPROM | Electrically Erasable Programmable Read Only Memory |
| SRAM, DRAM | Static RAM, Dynamic RAM |
| BIOS | Basic Input Output System |
| CMOS | Complementary Metal Oxide Semiconductor |
| HDD | Hard Disk Drive |
| SSD | Solid State Drive |
| USB | Universal Serial Bus |
| CD-ROM | Compact Disc Read Only Memory |
| DVD | Digital Versatile Disc |
| VGA | Video Graphics Array |
| HDMI | High-Definition Multimedia Interface |
| SMPS | Switched Mode Power Supply |
| UPS | Uninterruptible Power Supply |
| PCI | Peripheral Component Interconnect |
| SATA | Serial Advanced Technology Attachment |
| GPU | Graphics Processing Unit |
| NIC | Network Interface Card |
Input and Output Devices
| Abbreviation | Full Form |
|---|---|
| OCR | Optical Character Recognition |
| OMR | Optical Mark Reader (or Recognition) |
| MICR | Magnetic Ink Character Recognition (used in banks for cheques) |
| BCR | Bar Code Reader |
| LCD | Liquid Crystal Display |
| LED | Light Emitting Diode |
| OLED | Organic Light Emitting Diode |
| CRT | Cathode Ray Tube |
| DPI | Dots Per Inch (printer resolution) |
| PPM | Pages Per Minute |
| CPS | Characters Per Second |
| WYSIWYG | What You See Is What You Get |
Networking and Internet
| Abbreviation | Full Form |
|---|---|
| LAN | Local Area Network |
| MAN | Metropolitan Area Network |
| WAN | Wide Area Network |
| PAN | Personal Area Network |
| VPN | Virtual Private Network |
| WWW | World Wide Web |
| URL | Uniform Resource Locator |
| HTTP | HyperText Transfer Protocol |
| HTTPS | HyperText Transfer Protocol Secure |
| HTML | HyperText Markup Language |
| FTP | File Transfer Protocol |
| SMTP | Simple Mail Transfer Protocol |
| POP3 | Post Office Protocol version 3 |
| IMAP | Internet Message Access Protocol |
| TCP | Transmission Control Protocol |
| IP | Internet Protocol |
| DNS | Domain Name System |
| DHCP | Dynamic Host Configuration Protocol |
| ISP | Internet Service Provider |
| MAC | Media Access Control |
| SSID | Service Set Identifier (Wi-Fi network name) |
| Wi-Fi | Wireless Fidelity (a trade name) |
| GSM | Global System for Mobile Communications |
| CDMA | Code Division Multiple Access |
| SIM | Subscriber Identity Module |
| IMEI | International Mobile Equipment Identity |
| GPS | Global Positioning System |
| NFC | Near Field Communication |
Software, Programming and Data
| Abbreviation | Full Form |
|---|---|
| OS | Operating System |
| GUI | Graphical User Interface |
| CLI | Command Line Interface |
| DOS | Disk Operating System |
| IDE | Integrated Development Environment |
| API | Application Programming Interface |
| SQL | Structured Query Language |
| DBMS | Database Management System |
| RDBMS | Relational Database Management System |
| XML | Extensible Markup Language |
| CSS | Cascading Style Sheets |
| ERP | Enterprise Resource Planning |
| CRM | Customer Relationship Management |
| COBOL | Common Business Oriented Language |
| FORTRAN | Formula Translation |
| BASIC | Beginner’s All-purpose Symbolic Instruction Code |
| ASCII | American Standard Code for Information Interchange |
| BCD | Binary Coded Decimal |
| EBCDIC | Extended Binary Coded Decimal Interchange Code |
| Unicode | Universal Code (a character encoding standard) |
File Formats
| Abbreviation | Full Form |
|---|---|
| Portable Document Format | |
| DOC, DOCX | Document (MS Word) and the newer format |
| XLS, XLSX | Excel spreadsheet formats |
| PPT, PPTX | PowerPoint formats |
| TXT | Text file |
| RTF | Rich Text Format |
| JPEG or JPG | Joint Photographic Experts Group |
| GIF | Graphics Interchange Format |
| PNG | Portable Network Graphics |
| BMP | Bitmap |
| MP3 | MPEG Audio Layer 3 |
| MPEG | Moving Picture Experts Group |
| AVI | Audio Video Interleave |
| ZIP | A compressed archive format |
| EXE | Executable file |
| HTM, HTML | Web page file |
Security and Emerging Technology
| Abbreviation | Full Form |
|---|---|
| OTP | One Time Password |
| PIN | Personal Identification Number |
| 2FA | Two-Factor Authentication |
| CAPTCHA | Completely Automated Public Turing test to tell Computers and Humans Apart |
| DDoS | Distributed Denial of Service |
| SSL | Secure Sockets Layer |
| TLS | Transport Layer Security |
| AI | Artificial Intelligence |
| ML | Machine Learning |
| IoT | Internet of Things |
| VR, AR | Virtual Reality, Augmented Reality |
| SaaS, PaaS, IaaS | Software, Platform and Infrastructure as a Service |
| CERT-In | Indian Computer Emergency Response Team |
| NIC | National Informatics Centre |
| NPCI | National Payments Corporation of India |
| UPI | Unified Payments Interface |
| C-DAC | Centre for Development of Advanced Computing |
| ISRO | Indian Space Research Organisation |
Tips
- Learn the full forms in groups, and not in an alphabetical order.
- Note the commonly confused pairs: RAM and ROM, HTTP and HTTPS, LAN and WAN, OCR and OMR, BIOS and CMOS.
- MICR is used by the banks for cheques; OMR for the answer sheets; OCR for the text reading.
- Wi-Fi is a trade name and not a real abbreviation, though people write it as Wireless Fidelity.
Quick Tips
- Learn the full forms category-wise.
- Do not confuse OCR, OMR and MICR.
- Remember HTTP versus HTTPS.
- Revise a few abbreviations daily.
Quick Revision Points
- CPU: Central Processing Unit; RAM: Random Access Memory.
- LAN, MAN and WAN differ in range.
- OMR is for answer sheets; MICR is for cheques.
- URL: Uniform Resource Locator.
- IoT: Internet of Things.
Practice Questions With Answers
- What is the full form of BIOS?
Answer: Basic Input Output System - What is the full form of URL?
Answer: Uniform Resource Locator - What is the full form of HTTP?
Answer: HyperText Transfer Protocol - What is the full form of MICR?
Answer: Magnetic Ink Character Recognition - What is the full form of USB?
Answer: Universal Serial Bus - What is the full form of DNS?
Answer: Domain Name System - What is the full form of PDF?
Answer: Portable Document Format - What is the full form of JPEG?
Answer: Joint Photographic Experts Group - What is the full form of IoT?
Answer: Internet of Things - What is the full form of ASCII?
Answer: American Standard Code for Information Interchange
How to Practise This Chapter
Practise 10 questions every day and write the steps on paper. Then attempt timed sets from our practice papers and the previous year papers page. See all topics on the Computer Awareness notes page, read the previous topic Digital Payments, Social Media and Cyber Safety.
Frequently Asked Questions
What is the full form of CPU?
Central Processing Unit.
What is the full form of RAM?
Random Access Memory.
What is the full form of ROM?
Read Only Memory.
What is the full form of LAN?
Local Area Network.
What is the full form of WWW?
World Wide Web.
What is the full form of HTML?
HyperText Markup Language.
What is the full form of ISP?
Internet Service Provider.
What is the full form of SIM?
Subscriber Identity Module.
What is the full form of GPS?
Global Positioning System.
Is this topic asked in SSC?
Yes. Full forms are asked in almost every computer awareness paper.
What is the difference between OCR and OMR?
OCR reads printed text; OMR reads marked bubbles.
What is the full form of OTP?
One Time Password.
About the Author
Rahul Kumar
SSC Exam Expert & Content Editor
Rahul is a senior SSC exam strategist with 8+ years of experience helping aspirants crack CGL, CHSL and MTS exams. He writes in-depth notification breakdowns, exam pattern guides and preparation strategies.