Kali Devi is one of the incarnations of 'Shakti' of Durga. She is the power bestower and is believed by Hindus to be the destroyer of evils and enemies. This form of Durga is most adored in Bengal and Bihar. She is also called Mahishasur Mardini (The destroyer of Demon Mahishasur who was a frightening figure on earth at a time). Kali or Mahakali is specially adored during both the Navratras by the Hindus.