夜班 (yè bān) specifically means 'night shift' — a scheduled work period during the night. Unlike 夜 (yè) or 夜晚 (yè wǎn), which refer to the time of night in general, 夜班 is always tied to work or duty. 夜间 (yè jiān) is a broader term for 'nighttime' as a period, not a work shift.