In China, a public security bureau (PSB) (Chinese:公安局; pinyin:gōng'ānjú) refers to a government office essentially acting as a police station or a local or provincial police; the smallest police stations are called police posts (Chinese:派出所; pinyin:pàichūsuǒ). The PSB system is similar in concept to the Japanese Kōban system, and is present in each province and municipality. Typically, a PSB handles policing, public security, and social order, the other duties of such offices include residence registration ("hukou"), as well as internal and external migration matters, such as the registration of temporary residents (including both foreign and domestic visitors).