Narak Chaturdashi or Chhoti Diwali falls on the 14th day (Chaturdashi) of Kartik month, as per the Hindu calendar.
Narak Chaturdashi is celebrated the day after Dhanteras and the day before Diwali.
Narak Chaturdashi also goes by the names like Kali Chaudas, Narak Chaudas, Roop Chaturdashi, Roop Chaudas, Naraka Nivaran Chaturdashi, Bhoot Chaturdashi etc.
It is celebrated to mark the victory over the mythical demon king Narakasura by Lord Krishna.
People frequently take an oil bath before sunrise since it is said that Lord Krishna did the same after killing Narakasur to remove all the dirt and blood from his body.