‘夜班’ literally combines 夜 (yè), meaning 'night', and 班 (bān), meaning 'shift' or 'work schedule'. Together, it refers to a work period that takes place during nighttime hours—typically from late evening until early morning. It’s commonly used in contexts involving hospitals, factories, security services, transportation, and customer support centers where 24-hour operations are required.

This term is neutral in register and widely understood across formal and informal settings. Unlike English 'night shift', which may imply temporary or occasional duty, 夜班 often signals a regular, scheduled rotation within an employee’s weekly roster. It’s frequently paired with time expressions like '上夜班' (to work the night shift) or '值夜班' (to be on night duty), and may appear in schedules, labor contracts, or workplace announcements.