Wudhu is an action and a state one must be in before praying to Allah ﷻ.

It its an action that we do everyday and and without it we cannot perform our daily Salah which is one of the five pillars of Islam and the first thing one will be brought to account to on the Day of Judgement.

Shaykh Abu Abdisslam in this video describes and explains exactly how the Prophet Muhammad ﷺ made Wudhu.