JavaScript is a scripting language originally developed by Netscape mainly for use as code within a web page.

Javascript is very popular for common tasks such as validating data entry forms within a web page before they are submitted to the server. Javascript can also alter the way a page looks by dynamically changing CSS format settings within its page.

Another very popular JavaScript linked technology these days is AJAX which stands for Asynchronous Javascript and XML which is used to update details on a web page without having to refresh it as you go along.

Recently a lot of interest has arisen in using non-Flash technology for interactive web pages especially with HTML 5 and to that end a very popular library called Jquery has come along that offers users a lot of interactivity without using Flash. Jquery also supports a host of specialist plug-ins to extend the library.

Do not confuse JavaScript with Java as they are not the same thing.

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