A tattoo is body art that leaves permanent designs or pictures on the skin. They're applied via needle by depositing ink onto the second layer of skin. While the first tattoos were applied manually with a single needle that was first saturated in ink, today's tattoos are done by a machine. These machines feature multiple needles that pierce the skin simultaneously, speeding up the process and creating tattoos that are more visually appealing.
Tattoos are usually done in licensed tattoo shops. These shops adhere to health and cleaning standards and are typically regulated by state and municipal governments. While tattoos are generally safe, there are associated risks, including skin infections. Any person getting a tattoo is legally required to be at least 18 years of age. It's also inadvisable for anyone who isn't in good health to get a tattoo, as the body requires time and energy to heal and prevent infection.