What is the difference between a macbook pro and macbook?

Wanted to get information on whats the difference between the macbook pro and macbook in 2009. I am looking for information on my decision to purchase one and was wondering the difference is because some list macbook pro and some macbook.

MacBook pro best answer:

Answer by Deaf Mute
Macbook Pro’s use the unibody all aluminum body while the regular macbook was the while plastic unibody design (external differences)

Internally the Macbook Pro (with default options) should have a similar if not the same CPU, but more ram (4gb instead of 2gb) and a better GPU.

Macbook is now a generic term for both the Pro and Air as the original macbook line has since been discontinued.