Do you know that? 73% like freelancing because there is no commute / can work from anywhere next

What is the concept of Postback in ASP.NET?

A postback is a request sent from a client to server from the same page user is already working with.

ASP.NET was introduced with a mechanism to post an HTTP POST request back to the same page. It's basically posting a complete page back to server (i.e. sending all of its data) on same page. So, the whole page is refreshed.