***Ajax s 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 in the background without interfering with the display and behavior of the existing page. The use of Ajax techniques has led to an increase in interactive or dynamic interfaces on web pages. Data is usually retrieved using the XMLHttpRequest object. Despite the name, the use of XML is not actually required, nor do the requests need to be asynchronous***
***The term Ajax has come to represent a broad group of web technologies that can be used to implement a web application that communicates with a server in the background, without interfering with the current state of the page.***
***Jesse James Garrett explained that the following technologies are required:
-HTML or XHTML and CSS for presentation
-The Document Object Model for dynamic display of and interaction with data
-XML for the interchange of data, and XSLT for its manipulation
-The XMLHttpRequest object for asynchronous communication
-JavaScript to bring these technologies together.***
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