Public nudity is nudity that is not in private. It means a person being nude in a public place, or seen from public places. Nudity in private places, such as a home, swimming pool, or nudist club does not count, as these are private places.
In some places, public nudity may be legal. For example, some beaches are nude beaches, where nudity is allowed.
Nudism promotes public nudity in a group, but in special locations.