A ferocious appearance of Shiva. As Virabhadra he destroyed Dakshas sacrifice.
After that he beheaded Daksha and put a goat’s head on him. Then he took Sati’s body and started his dance of destruction. To save the world Vishnu threw his Sudarshana Chakra at Sati, she was cut into 51 pieces. Where they fell down on earth a place of worship was established, Shakti Pitha (Shakti is the female cosmic power, personified in Sati and Parvati).
List of Shakti Pitha
http://www.51shaktipeethcircuit.com/Peethas%20List.pdf