How does the Back button in a web browser work?

Question

I searched the Web about this question but I found nothing:

What is the logic of the back button? What is happening when we hit the back button on a Web browser?

Answer 1

The basic idea is to return to the last page or logical site division.

Looking at Gmail you'll see if you do a search and click a message then hit the back button it will take you back to the search that you did.

When you click it in most browsers it will either resend the last http request or will load a cache if the browser caches sites.