A legally designated public or national holiday when government or public offices (and often schools and businesses) are closed.
来週は祝日で会社が休みです。
Next week is a public holiday, so the company is closed.
祝日と土日が重なって三連休になった。
A public holiday fell on a weekend, creating a three-day holiday.
祝日は博物館が無料開放されることが多い。
Museums are often open for free on public holidays.