AJAX & JSON
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Ajax (shorthand for asynchronous JavaScript and XML) is a group of interrelated web development techniques used on the client-side to create interactive web applications. With Ajax, web applications can retrieve data from the server asynchronously, (that is, the page doesn't have to be refreshed) in the background without interfering with the display and behavior of the existing page. Ajax is not a technology in itself, but a group of technologies. Ajax uses a combination of HTML and CSS for marking up and styling information, as well as JavaScript to dynamically display and interact with the information presented.
JSON, short for JavaScript Object Notation is a lightweight computer data interchange format. The JSON format is often used for serialization and transmitting structured data over a network connection - that is it allows data to be transmitted across the Internet in a format that both the sender and reciever can understand. Ajax makes use of JSON to transmit information.
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