jQuery is a fast, concise, JavaScript Library that simplifies how you traverse HTML documents, handle events, perform animations, and add Ajax interactions to your web pages. jQuery is designed to change the way that you write JavaScript.
What jQuery Does
The jQuery library provides a general-purpose abstraction layer for common web scripting, and is therefore useful in almost every scripting situation. Its extensible nature means that we could never cover all possible uses and functions in a single book, as plug-ins are constantly being developed to add new abilities.
The core features, though, address the following needs:
1.Access parts of a page.
2.Modify the appearance of a page.
3.Alter the content of a page.
4.Respond to a user's interaction with a page.
5.Add animation to a page
6.Retrieve information from a server without refreshing a page.
(AJAX)
7.Simplify common JavaScript tasks.
more info -
http://jquery.com/
http://15daysofjquery.com/
http://jquery.com/blog/
