Javascript
JavaScript (JS) is the name of Netscape Communications Corporation's and now the Mozilla’s foundation implementation of the ECMAScript standard, a scripting language based on the concept of prototype based programming.
The language is best known for its use in websites (as client side JavaScript), but is also used to enable scripting access to objects embedded in other applications.
IMPORTANT: JavaScript is not Java!
JS can be used to do various things but it primarily comes into hand when:
- doing browser detection
- handling cookies
- controlling browsers
- validating forms
- setting CSS properties dynamically (see http://www.comptechdoc.org/independent/web/cgi/javamanual/javastyle.html), eg. element.style.border="1px solid black"