What do you understand by "Postback"?

ASP.NET is a server-side and not a client-side technology, events that occur on a page are handled by code running on the server. For this to work, ASP.NET uses the mechanism of “Postback”.

When an event is triggered, for instance a button is clicked; the page is submitted back to the server for processing, along with the information about the event and any pre-existing data on the page (via view state).

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