户口 (hùkǒu) refers to China's household registration system — a legal record of where you are registered as a resident, which determines your access to local public services like education, healthcare, and housing. The term can also refer to the statistical count of households and population in an area. For learners, understanding 户口 is essential because it affects daily life: having a local 户口 (e.g., in Beijing) gives you rights that non-local residents lack. It is not simply 'permanent residence' but a specific administrative status tied to a location.