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	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. The OED gives the etymology of tattoo as "In 18th c. tattaow, tattow. From Polynesian tatau. In Tahitian, tatu." The word tatau was introduced as a loan word into English, the pronunciation being changed to conform to English phonology as "tattoo". Sailors on later voyages introduced both the word and concept of tattooing to Europe.