Of all the buzzwords to enter the computer lexicon in the past couple of years, Ajax may be the “buzziest.” Ajax, which stands for Asynchronous JavaScript and XML (or not, depending upon whom you ask), changes the client/server relationship so that server interactions can take place without any apparent action on the part of the client. In truth, Ajax is just a label given to functionality that’s been present for years, but sometimes a good label helps, and when a powerhouse like Google uses Ajax (for Gmail, Google Suggest, and more), people pay attention.

Mostly GET method is used while creating Ajax apps. But at several instance when POST may be necessary for an ajax request.