Wikipedia
Tattoo
A tattoo is a marking made by inserting indelible ink into the layers of skin to change the pigment for decorative or other reasons. Tattoos on humans are a type of decorative body modification, while tattoos on animals are most commonly used for identification or branding.
Tattooing has been practiced worldwide. The Ainu, the indigenous people of Japan, traditionally wore facial tattoos. Today one can find Berbers of Tamazgha (North Africa), Maori of New Zealand, and Atayal of Taiwan with facial tattoos. Tattooing was widespread among Polynesian peoples and among certain tribal groups in the Taiwan, Philippines, Borneo, Mentawai Islands, Africa, North America, South America, Mesoamerica, Europe, Japan, Cambodia, New Zealand and Micronesia. Despite some taboos surrounding tattooing, the art continues to be popular in many parts of the world.
Etymology
The OED gives the etymology of tattoo as "In 18th c. tattaow, tattow. From Polynesian tatau. In Tahitian, tatu." The word tatau was loaned into English, the pronunciation being changed to conform to English phonology as "tattoo"."somoa"> Sailors on the voyage later introduced both the word and reintroduced the concept of tattooing to Europe.
Tattoo enthusiasts may refer to tattoos as "Ink", "Tats", "Art", "Pieces", or "Work"; and to the tattooists as "Artists". The latter usage is gaining greater support, with mainstream art galleries holding exhibitions of both traditional and custom tattoo designs. Copyrighted tattoo designs that are mass-produced to tattoo artists are known as flash, a notable instance of industrial design. Flash sheets are prominently displayed in many tattoo parlors for the purpose of providing both inspiration and ready-made tattoo images to customers.
The Japanese word irezumi means "insertion of ink" and can mean tattoos using tebori, the traditional Japanese hand method, a Western style machine, or for that matter, any method of tattooing using insertion of ink. read more at » http://en.wikipedia.org/wiki/Tattoo