It is a very fast and concise JavaScript Library that you can use while coding your web application. It is open source library (licensed under MIT License and the GNU GPL – General Public License)

This library supports the following:

1. It supports Document Object Model (DOM) element selections by employing the Sizzle engine ( an open source selector engine)

2. It can perform DOM traversal and modification Events

3. You can do manipulation of CSS sheets

4. Last, but not least, supports Ajax!

It is interesting to note that, the library also supports JavaScript Plugins for effective programming.

Still not convinced about the power. Here are few sites that use Jquery

• Google Code search
• Twitter
• Dell, Inc.
• IBM
• Amazon
• Microsoft (!)– for Visual Studio and ASP.NET MVC
• Netflix

And here are few open source projects that use this powerul tool

• Mozilla ( esp the Firefox Addon Community)
• WordPress
• Drupal
• DotNetNuke
• PEAR ( PHP Extension and Application Repository )

If you are a programmer don’t hesitate. Go head and utilize this great tool.

Resources:

1. Project Site
2. Documentation
3. Tutorials