A cat breed is an infrasubspecific rank for the classification of domestic cats. A cat is considered to be of a certain cat breed if it is true breeding for the traits that define that breed. Only three percent of owned cats belong to a cat breed, and an even smaller percentage of those are suitable as show cats. A breeding certificate proves that a cat belongs to a cat breed by showing the cat's pedigree back to at least four generations. The whole concept of cat breeds is a relatively new one. Two hundred years ago there was no such thing. Today there are almost a hundred cat breeds. Varieties of domestic cat can also be identified by characteristics other than breed.
Cat owners attempted to duplicate certain traits that their cat possessed, so they interbred them to produce a new breed.
Here we loosely group cats according to the length of their coat, but there are many variations within each, some breeds being found in more than one group.
A number of catbreeds are touted as being "hypoallergenic," and it's true, some breeds do produce fewer allergens and may cause fewer allergic symptoms among those with cat allergies.