AJAX is an acronym for Asynchronous JavaScript And XML. AJAX is not a programming language, but simply a development technique for creating interactive web applications. AJAX uses JavaScript to send and receive data between a web browser and a web server. The AJAX technique makes web pages more responsive by exchanging data with a server behind the scenes, instead of reloading an entire web page each time a user makes a change. With AJAX, web applications can be faster, more interactive, and more user friendly. AJAX uses an XMLHTTPRequest object to send data to a web server, and XML is commonly used as the format for receiving server data, although any format, including plain text, can be used. AJAX is a technology that runs in your browser. It uses asynchronous data transfer between the browser and the web server, allowing web pages to request small bits of information from the server instead of whole pages.