Sup, Im new to Bitcoin, I just downloaded the program a minute ago. I am quite suspicious on stuff on the internets, so dont wonder if my attitude is very "suspicioulish".

I have read all the "How to start" and the usual, and I understand its a P2P software, but I havent gotten any information on why the heck is it using my CPU so much. "Computational problems" isn't the most informative answer (P2P program is supposed to use only your internets connection, not your processor), so, I am asking here: why in the name of Chuck Norris Bitcoin is using my CPU so much? What is it actually doing?