CLIENT-SIDE SCRIPTING
JavaScript was designed to add interactivity to HTML pages.
JavaScript is a scripting language.
A scripting language is a lightweight programming language.
JavaScript is usually embedded directly into HTML pages.
JavaScript is an interpreted language (means that scripts execute without preliminary compilation).
Everyone can use JavaScript without purchasing a license.
simple note from me :
Javascript in HTML
for more details click this link:
http://www.w3schools.com/js/default.asp
