Pitbull is the common name for a type of dog descended from bulldogs and terriers. Formal breeds often considered to be of the pit bull type include the American Pit Bull Terrier, American Staffordshire Terrier, American Bully, and Staffordshire Bull Terrier... more on Wikipedia
Here are some pictures that will make you think differently about Pit Bull Terriers. Remember: "Judge the deed, not the breed!"
Related: 35 Cutest Staffordshire Bull Terrier Pictures Ever