AJAX stands for Asynchronous JavaScript and XML. It is based on the following technologies.

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JavaScript: The programming language used to develop Ajax applications, tying together the interaction of all of the other Ajax technologies.
XML: Provides a means of exchanging structured data between the Web server and client.
The XMLHttpRequest object: Provides the ability to asynchronously exchange data between Web browsers and a Web server.
HTML and CSS: Provide the ability to mark up and style the display of Web page text.
The Document Object Model or DOM: Provides the ability to dynamically interact with and alter the Web page layout and content.

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AJAX Structure