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Ajax also known Asynchronous JavaScript and XML is a set of Web Development techniques using many Web technologies on the client side to initiate asynchronous Web applications. Web applications can easily send data to and retrieve from a server asynchronously (in the background) without interfering with or affecting the display and behavior of the current page with Ajax. Ajax can also be regarded as client-side scripts that interact with (to and from) a server/database without a postback or a full page refresh or reloads. It is basically designed for exchange of data with a sending or receiving server as well as updating parts or portion of a web page on the go without going through the process of reloading the entire page.

Ajax itself is normally a basic term for a variety of JavaScript methods used to connect to a web server automatically without essentially refreshing the page. In a more simple way, it refers to the use of XmlHttpRequest objects to communicate with a web server dynamically via JavaScript. By separating the data interchange layer from the presentation layer, Ajax lets Web pages, and by extension Web applications, to change content animatedly without the need to reload the entire page. In actual fact, modern implementations usually alternate JSON for XML due to the advantages of being native to JavaScript.

Ajax is not a standalone technology, but to a certain extent a group of technologies. HTML and CSS can be used together to mark up and style information. The DOM is accessed with JavaScript to animatedly display and allow the user to interact with the information displayed. JavaScript and the XMLHttpRequest object simply provide a system for exchanging data asynchronously between browser and server to prevent full page reloads. Ajax lets you to make asynchronous calls to a web server. This lets the client browser to avoid waiting for all data to arrive before allowing the user to act once more. Ajax enabled applications will always be more responsive, faster and more user-friendly since a page postback has been eliminated.

Features of Ajax
  • Helps website pages load faster.
  • It is Independent in terms of server handling.
  • Optimizes web page performance i.e speed and user experience.
  • Behaviour or Action is instant, no page reload needed.
  • Improves pages and browser compatibility.
  • Asides obtaining the XMLHTTP object, all processing is same for all browsers. 
  • Ajax can be used to develop super-fast interactive web and mobile applications.
  • Saves time and bandwidth, because reload is not needed.

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