The Qur'an says:
“O you who believe! When you stand up for ritual prayer (sala), wash your face and your hands up to the elbows, and wipe a part of your head and your feet up to ankles.” (5:6)
Wudu by itself is always a recommendable act in Islamic rituals, but it becomes obligatory in certain circumstances. One of such circumstances is the daily ritual prayers; and therefore it is important for every Muslim to know the method of wudu and its rules.