What the Hell is a TrackBack?

What the Hell is a TrackBack? (Via Easy Bake Weblogs.) I need this a badly as anyone. As Andy Wibbels says, “TrackBacks are notoriously difficult to explain and is an exercise that makes a great judge of the skill of any self-described ‘blogging expert.’” Trackbacks are great when they are automated and they work. (WordPress is great for this! The feature was lacking in blogger, though I’ve seen others who hacked it in somehow.) Andy offers something of an explanation, though, that might help or serve as a refresher.