In religion revelation is central to understanding God and sprituality. It's a way of revealing the 'truth' of that religion.
There are two types of revelation:
Muslims often use the phrase, ‘Peace be upon him’ (pbuh) after saying the name of a prophet of Islam as a sign of respect eg,' Prophet Muhammad (pbuh).' In Arabic these salutations are called salawat. The phrase is abbreviated to SAW (Arabic) or PBUH (English).