Anonymous users(who have no account or are not logged on exchange) have this feedback option. What does it stands for? Is this information used for some kind of ranking or something related?
We moderators have access to some graph to track how much we get:
The latter let's you see questions that are underrated or overrated, which can be a good idea for users to keep an eye out for. Perhaps there are questions that have a lot of votes, but are actually wrong and needs correcting.