request approval?

Ok, we are new to ServiceDesk, What is the request approval used for?

I thought it would be for a tech to put in a solution, request the approval for the closure, but if they accept the request, it doesn't close it.

So, what's the point, or am I not looking at it correctly?

We are still in the process of getting it all setup, and working out workflows, etc. before rolling it out to staff...