AJAX is an abbreviation for Asynchronous Javascript and XML. This is a technique to communicate between browser and server using Javascript. It generates a lot of request but it decreases the amount of data send. Normally, when you re browser makes a request, the Server replys with a full page. Using AJAX, Javascript makes a request for you, and the Server replys not with a whole, but just with a part of a page. AJAX can cause problems, when using it and wanting bots to find the site using it, because they cannot understand or execute Javascript.

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