Image: wikipedia
Ink, dyes, and/or pigments may be injected into the dermis layer of the skin to create a design that is either permanent or temporary.
βΎοΈ Anchient hobby: Humans started doing it probably 2000+ years ago
π The origin may be traced back to Japan
π Newbies can read: The Big Book of Small Tattoos - Vol.1
Online course for beginners: Tattoo for Beginners