游客 (yóukè) is the common word for 'tourist' — someone traveling for leisure or sightseeing. It differs from 旅客 (lǚkè 'traveler, passenger'), which emphasizes being on a journey (often by transport), and from 客人 (kèrén 'guest, customer'), which refers to a visitor in a home or a customer in a business. In online gaming, 游客 also means 'guest player' (a player not logged in).