Shri Kaal Bhairav or Bhairava meaning Terrible or Frightful. Bhairava is the form of Shiva, when the holy Trinity Brahma, Vishnu, and Mahesh Shiva was caused to leave the heavens and come down to the different parts of the worlds because when Brahma Ji got Married to Saraswati he left and stayed in the heavans and Lord Vishnu got Married to Lakshmi and stayed in the ocean and Lord Shiva stayed with Parvati in a part of india on the mountain called Kailash. Then Vishnu asked him arrogantly who is the supreme creator of the Universe and Brahma said Worship me and you will find your answer and Since Brahma went to go marry the Goddess Saraswati he left the holy Trinity so Lord Shiva manifested his self in the form of Kaala Bhairava and slayed off Brahma ji's head and kept it in his hand because Shiva could not use his own hands to hurt the creator and Brahma had five heads and then became to four and in Bhairava's hand it shows the head of Brahma in his hand.
Bhairava (The Wrathful) is one of the more terrifying aspects of Shiva. He is often depicted with frowning, angry eyes and sharp, tiger's teeth and flaming hair; stark naked except for garlands of skulls and a coiled snake about his neck. In his four hands he carries a noose, trident, drum, and skull. He is often shown accompanied by a dog.
Bhairava is Shiva at his most terrifying, at his most fearful. He may be understood as a particular manifestation, or emanation of Shiva, or as Shiva displaying himself at a very high level. In some myths, Shiva created Bhairava as an extension of himself, in order to chastise Brahma. Bhairava is the embodiment of fear, and it is said that those who meet him must confront the source of their own fears. His name describes the effect he has upon those who behold him, as it derives from the word bhairo, which means to become fearful - of feeling great fear. In some sources, Bhairava himself is said to have eight manifestations, including Kala (black), Asitanga (with black limbs), Sanhara (destruction), Ruru (hound), Krodha (anger), Kapala (Skull), Rudra (storm) and Unmatta (raging). Dogs (particularly black dogs) were often considered the most appropriate form of sacrifice to Bhairava, and he is sometimes shown as holding a severed human head, with a dog waiting at one side, in order to catch the blood from the head.