I said that a sessions sets the user information on the user's computer and it gets destroyed after the browser is closed. When a session is opened on another page, it scans the computer for the information. The guys kept asking me the same question again in a different way. I was really confused as to what they were actually looking for and when I asked what is the answer they said "let's move on". I might of panicked at some point and called it a "browser id" instead of a user key but that's after a few tries and I was really confused on what he was looking for.