What is jQuery?
The jQuery library contains the following features:
HTML element selections
HTML element manipulation
HTML event functions
HTML DOM traversal and modification
Two versions of jQuery are available for downloading: one minified and one uncompressed (for debugging or reading).
Both versions can be downloaded from jQuery.com.
Alternatives to Downloading
If you don't want to store the jQuery library on your own computer, you can use the hosted jQuery library from Google or Microsoft.
Adding the jQuery Library to Your Pages
It can be added to a web page as
1. Inline mark-up
2. Embedded Mark-up.
3. Or as an Link of a External File