what does "requests" mean in usage statistics?

Discussion created by andyinscotland on Apr 30, 2013
We are trying to establish how many people are accessing our feature services. In the usage field for the feature service  I get a figure of 12,000 for one day. The web site master says 243 unique visitors clicked on the link from our website to the maps on the same day. That's a big difference.

I'm aware that hits v unique visitors v requests v viewed can be different but not by more than 10 to 1 in my experience.