By now you know that URL stands for Uniform Resource Locator.

You've probably long known that HTTP means HyperText Transfer Protocol, and that USB stands for Universal Serial Bus.

How many other geeky acronyms do you encounter in the course of a week or a month without knowing what the letters mean? Here, for your edification, are 36 such business, computer, and general purpose acronyms, so that geeks realize  you at least know something about their world:

ASCII = American Standard Code for Information Interchange
ATM = Asynchronous Transfer Mode
CPU = Central Processing Unit
DCIM = Digital Camera Images
DNS = Domain Name System
DRAM = Dynamic Random Access Memory

DVD = Digital Video Disk and, later, Digital Versatile Disc
DVR = Digital Video Recorder
HTML = Hypertext Markup Language
IMAP = Internet Message Access Protocol
IRC = Internet Relay Chat
IP = Internet Protocol

ISBN = International Standard Book Number
ISDN = Integrated Services Digital Network
ISO = International Standard for Organization
ISP = Internet Service Provider
LASER = Light Amplification by Stimulated Emission of Radiation
LED = Light-Emitting Diode

MPEG = Moving Picture Experts Group
MODEM = Modulator-Demodulator
OCR = Optical Character Recognition
PDF = Portable Document Format
RADAR = Radio Detection And Ranging
RFID = Radio Frequency Identification

SCUBA = Self-Contained Underwater Breathing Apparatus
SDRAM = Synchronous Dynamic Random Access
SEO = Search Engine Optimization
SIM = Security Information Management
SMS = Short Message Service
SMTP = Simple Mail Transfer Protocol

TCP/IP = Transmission Control Protocol/Internet Protocol
WIFI = Wireless Fidelity    
UPC = Universal Product Code    
USP = Unique Selling Proposition
VLAN = Virtual Local Area Network
VPN = Virtual Private Network