it's a re-cap of rules of the road. Everything from street signage to lane changing, parallel parking rules, 4-way stops (we need EVERYONE here in Cal to relearn that one, I think!), it pretty much covers everything - it's very thorough. The online one is anyway, the others aren't as thorough or as interesting, in my opinion.
When you finish does it get you out of paying the fine and reduce the points?