What is AJAX

What is AJAX ( Asynchronous JavaScript and XML ):
As of formal terminology AJAX is a term describing a web development technique for creating interactive web applications using a combination of: * HTML (or XHTML) and Cascading Style Sheets for presenting information* Document Object Model, JavaScript to dynamically display and interact with the information presented* XML, XSLT and the XMLHttpRequest object to interchange and manipulate data asynchronously with the web server (although AJAX applications can use other technologies .

OR we can say that, AJAX is a scripting technique for silently loading new data from the server. Although AJAX scripts commonly use the soon to be standardized XMLHttpRequest object, they could also use a hidden iframe or frame. An AJAX script is useless by itself. It also requires a DOM Scripting component to embed the received data in the document.

That is if somebody wants to interact with the database having some value from a form we have to post the form to a certain page. That page deals with the database. So when ever we want some thing to do with the database we have to post something, so that page starts loading and after some time it gives me my destined result.

But with ajax methodology this idea of interacting with database simplifies and full loading of a page and time consumption became less hazardous.