Introduction to Javascript:

JavaScript is the most popular scripting language on the web because of its simplicity and dynamic usage.
JavaScript enables the programmer to have the flexibility needed to create a powerful, secured, traceable, and validated web page.

Advantages of using javascript:

Javascript gives you the flexibility you need to make you page powerfull, secured, trackable, validatable and much more.So here is a few advantages that this client script language has to offer:

• Javascript is an alternative to server side script "more details later on"
• Javascript is easily embedded to html page
• No need to compile the code.
• Javascript provide a good validation for the html controls
• Javascript provide interactivity to your site.
• JavaScript provides the programmer with the flexibility to build secured applications.
• In addition JavaScript speeds up the design process more so than other server side scripting processes.
  

Example1: "Hello World"