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Regarding this, what is Ajax and why it is used?

AJAX = Asynchronous JavaScript and XML. AJAX is a technique for creating fast and dynamic web pages. AJAX allows web pages to be updated asynchronously by exchanging small amounts of data with the server behind the scenes. This means that it is possible to update parts of a web page, without reloading the whole page.

Also, why do we use AJAX calls? Making Asynchronous Calls: Ajax allows you to make asynchronous calls to a web server. This allows the client browser to avoid waiting for all data to arrive before allowing the user to act once more. Increased Speed: The main purpose of Ajax is to improve the speed, performance and usability of a web application.

Also know, what are Ajax calls?

An Ajax call is an asynchronous request initiated by the browser that does not directly result in a page transition. A servlet request is a Java-specifc term (servlets are a Java specification) for servicing an HTTP request that could get a simple GET or POST (etc) or an Ajax request.

Should I use Ajax?

Use ajax only in those cases for what it has been invented. If you can do something without using ajax, than never try to make it done using ajax. If you really want some asynchronous communication then only then use it. The next paragraph describes where exactly should you use it.