What is java script?

Hi guys,
i have basic know of html and Dreamweaver... actually i didn't get understand what is java script and its use.?

 

Have you tried searching in wikipedia? There is well explained what it actually is and its usage as well! http://en.wikipedia.org/wiki/Javascript

 

JavaScript is an interpreted programming or script language from Netscape. It is somewhat similar in capability to Microsoft'sVisual Basic, Sun's Tcl, the UNIX-derived Perl, and IBM's REXX. In general, script languages are easier and faster to code in than the more structured and compiled languages such as C and C++. Script languages generally take longer to process than compiled languages, but are very useful for shorter programs.