An AJAX application introduces a layer between the user and the server which comprises of the AJAX engine. This eliminates the adhoc interaction between the client and the server and makes the application more responsive.
A browser loads an AJAX engine instead of the web page and then communicates with the server on users behalf as well as provides the user with an interface.
As the communication with the server in AJAX is asynchronous, the user doesn’t have to wait for a server response.
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