jQuery has a number of functions and methods and plugins for performing AJAX functionality. These methods are used for loading and retrieving data from the server without a complete page refresh.
These AJAX methods allow you to request text , HTML, XML or JSON files from a remote server.
Using jQuery to do your AJAX functions can reduce the coding and minimize the complexity. It also aids in cross-browser compatibility.
The full list of jQuery AJAX methods can be found at: http://api.jquery.com/category/ajax