system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:How do some websites keep you from navagating back?
gpt
Usually, this is done by sending people to a page, which immediately redirects to another page.  So, if you click back on the second page, it just sends you back to the first page which immediately redirects you again.

Usually, if you click back fast enough, you can get past it and eventually make it back to where you were.