Question

Where does magnetism comes from?

Magnetic forces arise from the movement of electrons (electric charge).

In case you want it, here is more information on magnetism.

http://en.wikipedia.org/wiki/Magnetism
http://www.phy6.org/Education/Imagnet.html
http://www.factmonster.com/ce6/sci/A0831162.html

In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.

I hope this helps a little more. Thanks for asking.