Prior to entering Salah (Prayer), the person is required to undertake a certain purification procedure known as "Wudu" (Ablution) without which, the person's prayer would not be acceptable in the sight of Almighty Allah. This performance is called wudu (ablution) and it should be preferably carried out as per procedure told by Allah in Quran and also by our Prophet Mohammad (S.A.W.) in Hadith.