which one is better JQuery Ajax or Ajax Control toolkit?

Hello everyone,

I am a beginner of asp.net platform.

I want to use ajax in my new project. So i want to know which one should be better  Ajax using JQuery or  asp.net built in ajax control.

I want to use Jquery for front end view. But is it better to use Jquery Ajax?

If can explain with example, i will be better for me to understand.

Thank You.