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# AJAX Introduction * * * AJAX is a technique for updating parts of a web page without reloading the entire page. * * * ## What is AJAX? AJAX = Asynchronous JavaScript and XML. AJAX is a technique for creating fast and dynamic web pages. AJAX allows web pages to be updated asynchronously by exchanging small amounts of data with the server behind the scenes. This means that parts of a web page can be updated without reloading the entire page. Traditional web pages (without AJAX) must reload the entire page if the content needs to be updated. There are many application cases using AJAX: Google Maps, Gmail, Youtube, and Facebook. * * * ## How AJAX Works  * JavaScript/DOM (for displaying/retrieving information) * CSS (for styling data) * XML (commonly used as the format for data transfer) ![Image 4: lamp]( AJAX applications are browser and platform independent! * * * ```