jQuery solves major JavaScript problems. jQuery is preferred over JavaScript due to following reasons.

• jQuery is light weight library for developing client side applications including ajax.
• jQuery assists to keep code simple and concise and reusable. Huge line of code developed using JavaScript can be eliminated with just few lines of jQuery.
• jQuery library simplifies the process of traversal of HTML DOM tree.
• jQuery can also handle events, perform animation, and add Ajax support in web applications.