Tattooing is the process of inserting ink, dyes, or pigments into the skin to create a permanent or temporary design. The ink is injected into the dermis, or deep layer, of the skin using a needle or machine: Traditional tattooing: Involves rubbing pigment into cuts. Modern tattooing: Uses a handheld machine with needles that pierce the skin and deposit ink. Tattoos can be a form of self-expression, fashion statement, or a way to mark social, political, or religious groups. They have been used across cultures for many purposes, including as a way to place protective or therapeutic symbols on the body.