The term "client-side" refers to that portion of a web application which runs in the user's browser. Client-side code is most commonly written in Javascript, HTML and CSS. The counterpart of "client-side" is "server-side", i.e., the part of a web application running at the web server.
There are other many client-side techniques, in addition to javascript used in the user's browser such as:
- HyperText Markup Language html
- Cascading Style Sheets css
- Macromedia flash actionscript
- Java applet
- Microsoft vbscript
See also: server-side