An looped redirect is a type of infinite redirect, in which a group of 2 or more redirects are strung together in a chain that recursively redirects to a URL earlier in the chain.
Looped Redirect Example:
URL | Redirect Target
http://www.example.com/page-1 > http://www.example.com/page-2
http://www.example.com/page-2 > http://www.example.com/page-3
http://www.example.com/page-3 > http://www.example.com/page-1
In this example, we can see that when we get to page-3, we will go back to page-1 and begin the loop again. We will never exit the loop.