1. Ease of access document element.
2. Modify the look and feel of a page..
3. Changing the contents of the page.
4. Responding to user interaction with a page.
5. Animating: Add animation to the document.
6. Retrieving information from a server without a page refresh.
8. jQuery specifically created the library to make common tasks trivia.
9. jQuery offers a robust and efficient selector mechanism for retrieving exactly the piece of the document that is to be inspected or manipulated.