What do you understand by callbacks?

1.	What do you understand by callbacks?
Answer» Developers use AJAX to perform callbacks. These callbacks are ACTIONS (FUNCTIONS) that are executed when an asynchronous task completes and is used to handle the outcome. This callback process takes a round trip to and from the SERVER without posting the complete page to the server. Thus, this technique helps AJAX interact with the server without a page refresh. By not performing a TOTAL postback and sending all form-related data to the server, the AJAX callback helps in reducing network utilization.

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