Naraka Chaturdashi is also known as "Kali Chaudas",  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 Hindu literature narrates that the asura (demon) Narakasura was killed on this day by Krishna, Satyabhama and Kali. 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. She is called Kali Mata ("the dark mother") and also kali which, as Coburn notes, can be read here either as a proper name or as a description "the dark blue one". 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. 
