AJAX stands for Asynchronous JavaScript and XML. AJAX is a technique which helps creating better, faster, and more interactive web applications with the help of XML, HTML, CSS, and JavaScript. AJAX uses XHTML for content, CSS for presentation, along with Document Object Model and JavaScript for dynamic content display. Conventional web applications transmit information to and from the server using synchronous requests. It means you fill out a form, hit submit, and get directed to a new page with new information from the server. With AJAX, when you hit submit, JavaScript will make a request to the server, interpret the results, and update the current screen. In the purest sense, the user would never know that anything was even transmitted to the server. AJAX is a web browser technology independent of web server software.