uh whats wrong with wikipedia?!
usually googling for computer science related topics reveal a link to wikipedia within the top ten results anyway...
but also if you want a quick overview of something youve never heard of wikipedia is just great.

anyway: i guess when you hear the course youll say: "all that stuff can also be done without objects (e.g. pure c code)- the oop sucks"
but once you understood it, you wouldnt want to move away from it again
(at least i started with c, then learnt c++, and now i never want to touch pure c code ever again)