休日 is a general term for any day off from work or school. Composed of 休 (rest) + 日 (day).
COMMON COLLOCATIONS:
- 休日出勤: working on a day off
- 休日手当: holiday pay/allowance
- 休日を楽しむ: to enjoy one's day off
- 休日を過ごす: to spend a day off
CONTRAST:
- 休日: day off (general — includes weekends and holidays)
- 祝日: national holiday (officially designated)
- 平日: weekday (opposite of 休日)
- 休暇: vacation, leave (a period of days off, often planned)
- 定休日: regular closing day (for shops and restaurants)