Wudu (الوضوء‎‎) is the Islamic procedure for washing parts of the body, a type of ritual purification. Wudu involves washing the hands, mouth, nostrils, arms, head, and feet with water, and is an important part of ritual purity in Islam. What activities require wudu, what rituals constitute it, and what breaks or invalidates it are governed by fiqh (Islamic jurisprudence).