The goal of AJAX technology is to speed Web applications that have frequent user interactions. AJAX uses Javascript as the primary programming language and XML. The other technologies used are DOM and CSS.
A typical session of Web use starts when the user request for a page, either by typing the URL or clicking a link to the page shown on the web browser. The web browser then has to wait until the page is provided from the server to display it to the user. If the user makes a change to the document there may not be a need to re display the entire document.
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