Difference between a Postback and a Callback

Question

I keep on hearing this words \'callback\' and \'postback\' tossed around.
What is the difference between two ?

Is postback ver

Answer 1

A postback occurs when a request is sent from the client to the server for the same page as the one the user is currently viewing. When a postback occurs, the entire page is refreshed and you can see the typical progression on the progress bar at the bottom of the browser.

A callback, generally used with AJAX, occurs when a request is sent from the client to the server for which the page is not refreshed, only a part of it is updated without any flickering occuring on the browser