What is janabah and how is purification from it achieved?

Question:
May Allah reward you, Honorable Shaykh. In his second question, he asks: What is janabah, and how is purification from it achieved?

Answer:
Janabah is the emission of semen with pleasure, the gushing forth of semen with pleasure. This is janabah, whether it occurs through intercourse or otherwise. If semen gushes out from him with pleasure and he is awake,
then he is in a state of janabah. However, if semen comes out from him without pleasure, this is not janabah; rather, it is a minor state of ritual impurity. If it comes out without pleasure, it is a minor state of ritual impurity that requires wudu'. As for the sleeping person who has a wet dream,
and water comes out from him, he is in a state of janabah, because he does not feel pleasure while sleeping; he does not perceive it. So if he finds wetness on his garment or on his body after his sleep, he is in a state of janabah, based on the saying of the Messenger (peace and blessings be upon him) even if he did not recall pleasure and did not feel pleasure, because the sleeping person does not perceive anything. Purification from janabah is by taking a full ritual bath.
Purification from janabah is by taking a full ritual bath of the entire body. One should first perform istinja', then perform wudu' as for prayer, then pour water on his head until it is thoroughly wet, three times, then pour water over the rest of his body. The most complete way is three times, pouring water over his body three times. The sufficient way is once, covering his entire body with the intention of removing janabah.