Sho more or less has it correct, although BJJ and Judo, as they are practiced, are clearly seperate entities at this point.
BJJ focuses on ground grappling. There are some takedowns, but most places don't practice them often enough--usually what you learn for takedowns, is good enough to take out the untrained, but I don't like that approach, personally.
Judo/shuai chiao/wrestling + BJJ= a solid grappling force.
BJJ schools all have one thing in common--you will NOT find a legit school that doesn't spar for a good deal of time. The least I have ever sparred is 10 minutes. The longest during class time was over an hour. Most of the time, we average around 30 minutes. That really doesn't vary from school to school--there's sparring time, period, and it's an integral part of the training.
BJJ focuses on obtaining a superior position and then submitting your opponent with a variety of holds and chokes. Most places do have some sort of no gi class from time to time, so you get a bit of both.
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