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), M?ori of New Zealand, and Atayal of Taiwan with facial tattoos. Tattooing was widespread among Polynesian