A
- A9
- A9 is a search engine from Amazon.com. A9's main results are taken from Google, but it also offers specialist searches from other sources.
- AJ
- Acronym of Ask Jeeves (a Search Engine)
- AJAX
- AJAX (Asynchronous JavaScript and XML) is a web development technique for creating interactive web based applications that can asynchronously interchange data between server and client.
- AOL
- America Online (a search engine)
- API
- Application Programming Interface
- ASCII
- American Standard Code for Information Interchange
- ASP
- [Microsoft] Active Server Pages
- ASPX
- [Microsoft] Active Server Page Framework
- ATF
- Above the Fold
- ATW
- All The Web (a Search Engine)
- AV
- Acronym of AltaVista (a search engine)
- AdBrite
- AdBrite is a marketplace for buying and selling advertising space on individual websites.
- Alexa
- Alexa is an Amazon.com subsidiary which provides traffic statistics on the sites in in its index.
- Anchor Text
- The (usually) clickable text element representing a hyperlink.