Scavenger hunts

  • OK, I give up... I've seen the term "scavenger hunt" on other sites, too, but I just don't know what it means. It seems to be assumed here that we do know but I don't. I looked at the Scavenger hunt pages here, and still don't have a clue.

    So: what is a "scavenger hunt" in general, what are "scavenger hunts" on this site, and how does one use them, and why and what for?