Below you can find some useful full forms.
Technical
PHP : Hypertext Preprocessor
PEAR : PHP Extension and Application Repository
Ajax : Asynchronous JavaScript and XML
SOAP : Simple Object Access Protocol
HTML : Hypertext Markup Language
CSS : Cascading Style Sheets
SQL : Structured Query Language
ANSI : American National Standards Institute
DBMS : Database Management System
RDBMS : Relational Database Management System
DDL : Data Definition Language
DML : Data Manipulation Language
GIF : Graphics Interchange Format
JPEG : Joint Photographic Experts Group
MPEG : Moving Picture Experts Group
PNG : Portable Network Graphics
AVI : Audio Video Interleaved
HTTP : Hypertext Transfer Protocol
W3C : World Wide Web Consortium
IETF : Internet Engineering Task Force
IRTF : Internet Research Task Force
APC : Alternative PHP Cache
APD : Advanced PHP debugger
SVN : Subversion (version control system)
PDO : PHP Data Objects
FTP : File Transfer Protocol
SFTP : Secure File Transfer Protocol
CGI : Common Gateway Interface
DOM : Document Object Model
JSON : JavaScript Object Notation
MSI : Microsoft Installer
XMPP : The Extensible Messaging and Presence Protocol
REST : Representational State Transfer
RSS : Really Simple Syndication
URL : Uniform Resource Locator
XML : Extensible Markup Language
SPAs : Single Page Applications
RFQ : Request For Quotation
XHR : XML HTTP Request
Non-technical
NEWS : North East West South
WHO : World Health Organization