Bhairav is one of the ten basic thaats of Hindustani music from the Indian subcontinent.
Bhairava is one of the names of Shiva especially in his powerful form as a naked ascetic with matted locks and body smeared with ashes.
The ragas too have some of these masculine and ascetic attributes in its form and compositions.
The Bhairav raga itself is extremely vast and allows a huge number of note combinations and a great range of emotional qualities from valour to peace.
Ragas belonging to the Bhairav thaat include: 2. https://www.parrikar.org/hindustani/bhairav/