Ajax allows the user to interact with a web server asynchronously, without using a plug-in. This asynchronous interaction of user with the web server is possible with the help of XMLHttpRequest object found in browsers.
Advantages of AJAX
AJAX makes your application more user friendly, faster, and more interactive.
AJAX uses asynchronous data transfer (HTTP requests) between the browser and the web server, by allowing web pages to request small bits of information from the server instead of entire pages.
Ajax minimize the round trips to the server.
Disadvantage of AJAX
It is difficult to bookmark a specific state of the web page since page changes dynamically.
What is Asp.Net AJAX?
ASP.NET AJAX is an extension to Asp.Net, developed by Microsoft to make dynamic, client-centric, user-friendly, and interactive web applications. ASP.NET AJAX has its own AJAX Library and AJAX controls to develop rich Web applications that communicate with the server using asynchronous postback.
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