A nude beach, sometimes called a clothing-optional or free beach, is a beach where users are at liberty to be nude. Nude beaches usually have mixed bathing. Such beaches are usually on public lands, and any member of the public is allowed to use the facilities without membership in any movement or subscription to any personal belief. The use of the beach facilities is normally anonymous. Unlike a naturist resort or facility, there is normally no membership or vetting requirement for the use of a nude beach. The use of nude beach facilities is usually casual, not requiring pre-booking. Nude beaches may be official (legally sanctioned), unofficial (tolerated by residents and law enforcement), or illegal.