Yeah, a black hole is an extremely dense star that implodes in itself under huge amount of mass. In order for a star to become a black hole, it would have to be thousands of times more dense than our Sun. The star basically collapses into itself, and it is so dense that not even light can escape its gravity. If you go into a black hole, you will essentially be squished into a singularity.
There are supermassive black holes at the center of each galaxy, and probably thousands of black holes just wandering around all over the place.
Worm holes, like Photon said, are theoretical. They are a way to get from point a to point b without "driving" there.The theory is to bend "space-time" so you emerge at the chosen point without actually having traveled the linear distance, because as we all know according to Einstein, we can only travel as fast as the speed of light. Therefore, to get anywhere over 100 light years away in one lifetime, we would need to bend space-time.
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