The term "pit bulls" refers to a group of dogs that belong to the American Pit Bull Terrier breed. These are medium-sized, strong and muscular dogs with short fur and a broad head. They were originally bred for dog fighting in the 19th century but today they are often used as family pets due to their loyal and friendly nature. However, there is some controversy surrounding these dogs because of their history and some people believe that they should be banned or heavily regulated.