‘Hùkǒu’ (户口) literally combines ‘hù’ (household, family unit) and ‘kǒu’ (mouth, used here as a classical measure word for people). Together, it refers to China’s official household registration system — a legal record linking individuals to a specific geographic location, traditionally tied to access to public services like education, healthcare, and housing. Unlike a simple ID card or residence permit, hukou is inherited at birth and historically difficult to change.

The system creates two main categories: rural and urban hukou, with significant implications for social mobility and resource allocation. While reforms have relaxed some restrictions in recent years, hukou remains deeply embedded in administrative practice — affecting everything from school enrollment to marriage registration and even job applications in major cities. It reflects both bureaucratic identity and socio-economic status in contemporary China.