Ajax stand for Asynchronous JavaScript and it is a method of building interactive applications for the Web that process user requests immediately. It is combined with several programming tools including JavaScript, dynamic HTML, Extensible Markup Language , cascading style sheets , the Document Object Model (DOM) and the Microsoft object XMLHttpRequest. Ajax allows content on Web pages to update immediately when a user performs an action whereas in the HTTP request users must wait for a whole new page to load. All the Applications created with Ajax via using engine that acts as an intermediary between a user's browser and the server from which it is requesting information.