What are the odds in favor of pulling 2 spades from a 52 card deck?

I know there are 13 spades. I know the first pull has a 13/52 change of being a spade and the second pull has a 12/51 chance of being pulled.

However in order for the odds in favor I need to know the overall probability to pull 2 spades. I only know how to find the individual probability for each pull. How do I find the overall probability?