Naraka Chaturdashi is also called as "Kali Chaudas", where Kali means dark (eternal) and Chaudas means fourteenth, this is celebrated on the 14th day of the dark half of Aaso,In some regions of India, Kali Chaudas is the day allotted to the worship of Mahakali or Shakti and is believed that on this day Kali killed the asura (demon) Narakasura.
Naraka Chaturdashi (also known as Kali Chaudas, Roop Chaudas, Choti Diwali , Naraka Nivaran Chaturdashi or Bhoot Chaturdashi) is a Hindu festival, which falls on Chaturdashi (14th day) of the Krishna Paksha in the Shalivahan Shaka Hindu calendar month of Ashwin. The festival is also called as "Kali Chaudas", where Kali means dark (eternal) and Chaudas means fourteenth, this is celebrated on the 14th day of the dark half of Aaso. In some regions of India, Kali Chaudas is the day allotted to the worship of Mahakali or Shakti and is believed that on this day Kali killed the asura (demon) Narakasura. 
