Today, people choose to be tattooed for many different reasons. Tattoos may also be used to show that a person belongs to a specific group. For example, gang tattoos may show that a person belongs to a certain criminal gang. Criminal tattoos may also show a person's criminal accomplishments (such as the number of years they spent in prison, or the number of people they have killed). Tattoos, including full-body tattoos, are popular among the Yakuza (JapaneseMafia).