BitCoin mining works by using your computers GPU to solve large equations which then send BitCoins, a virtual currency into your computer which can be sold and traded like stocks. There is currently about 130 Million dollars left of bitcoins to be mined.
You could have used Google but whatevs
PS look at this shit. It makes me mad
http://gyazo.com/d62de3133e2e08d0ea16343be2b3a66a
same shit happens when I render videos
mind you im on a shitty imac with a bad GPU and CPU.