tattoo is a form of body modification.
'ink permanently implanted under the
skin
Tattooing is a process by which pigment (ink) is permanently deposited (implanted) under the
skin (well, into the non-exfoliating layers of skin).
We have archeological records of tattooing going well into pre-
history (the tattooed iceman dates at 3300
BC). The word itself sources from "tattau", a Tahitian word which translates essentially as "to mark".' -Shannon Larratt
nowadays, there are technology to remove the tattoo such as a laser. thus, meaning the tattoo is a tattoo till is removed.