The Persian is one of the oldest breeds of cat. In Britain, it is called the Longhair or Persian Longhair. A Persian without an established and registered pedigree is classed as a domestic long hair cat.

The 1911 Encyclopædia Britannica (Encyclopædia) suggests that the Persian is derived from the Pallas Cat. A photograph accompanying the entry in the Encyclopædia shows a Blue Persian Cat, the conformation of which we would now call a "Doll Faced Persian" or "Traditional Persian". Early photographs and drawings from magazines show the Persian as a Traditional Persian Cat. The Persian was first registered with the Cat Fanciers Association (CFA) in 1871 when the association first kept records.

Photographic records indicate that Persians, up until the 1960s, show a difference in appearance to cats of the early 1980s onwards (i.e., from the Traditional "doll face" to the "extreme", "ultra", "flat-faced" or "snubby" face of today). However, the Persian Breed Council's standard for the Persian had remained basically unchanged over this period. The Persian Breed Standard is by its nature somewhat open ended and focused on a rounded head.

It is generally accepted (and by the Breed Council) that through selective breeding, in an attempt to develop the ideal Persian appearance, the Ultra Face came about . This has been called ultra-typing . The Persian Breed Council's standard was changed during the late 1980s to limit the development of the extreme appearance. In 2007 the Persian Breed Standard was altered to reflect the flat face and it now states that the forehead, nose, and chin should be in vertical alignment.

Conscientious breeders take into account and minimize health issues by careful choice of breeding stock with more moderate head type, as the stated goal of most breeders is first and always healthy cats.

Persian cats can have any color or markings including pointed, golden, tortoiseshell, blue, and tabby. Tipped varieties are known as Chinchilla. Point varieties are called Himalayan in the United States and Colorpoint Persian in Europe.

In the USA, there was an attempt to establish the Silver Persian as a separate breed called the Sterling, but it was not accepted and Silver and Golden longhaired cats, recognized by CFA more specially as Chinchilla Silvers, Shaded Silvers, Chinchilla Goldens or Shaded Goldens are judged in the Persian category of cat shows. In South Africa, the attempt to separate the breed was more successful: the SA Cat Council (SACC) registers cats with 5 generations of pure bred Chinchilla as a Chinchilla Longhair. The Chinchilla Longhair has a slightly longer nose than the Persian, resulting in healthy breathing and no tearing of the eyes. Its hair is translucent with only the tips carrying black pigment: a feature that gets lost when out-crossed to other colored Persians. Out-crossing also may result in losing nose and lip liner, which is a fault in the Chinchilla Longhair breed standard. One of the distinctions of this breed is the blue-green or green eyecolor only with kittens having blue or bluish purple eyecolor.

Because their fur is too long and dense for them to maintain themselves, Persian cats need regular grooming. To keep their fur in its best condition, they must be bathed regularly, dried carefully afterwards, and brushed thoroughly every day. Their eyes need to be checked for problems on a regular basis because some animals have trouble keeping them clean. As they grow older, Persians tend to develop a crusty-like object under the eyes. Likewise, Persians are particularly susceptible to a genetic disease which causes kidney failure, PKD, Polycystic kidney disease, among other diseases. However, cats can now be DNA screened for the gene that causes PKD, so these affected cats are gradually being removed from the Persian gene pool by responsible breeders.