Tom or Tabby is a term used to refer to cats of any breed. It is derived from the two most popular breeds of cats, the Tomcat and the Tabby. The Tomcat is a medium-sized, short-haired breed of CAT that is known for its intelligence and playful nature. The Tabby is a medium-sized, long-haired breed of CAT that is known for its affectionate and gentle personality. Both breeds are popular among CAT owners due to their unique personalities and characteristics.