Narak Chaturdashi, also known as Choti Diwali or Roop Chaudas, is observed on the fourteenth day of the dark fortnight of the Hindu month of Ashwin. The celebration is closely associated with the defeat of the demon Narakasura by Lord Krishna, and the story is narrated in the Bhagavata Purana. Here is a detailed version of the story: The Legend of Narakasura: Narakasura was a powerful demon with a boon that made him nearly invincible. Over time, he became increasingly tyrannical, causing havoc in the world. He defeated the gods and even took control of the heavens. His tyranny reached a point where he kidnapped 16,000 princesses and imprisoned them in his palace. Unable to tolerate Narakasura's cruelty, the gods sought help from Lord Krishna. Recognizing the gravity of the situation, Krishna decided to confront Narakasura and end his reign of terror. Krishna's Battle with Narakasura: A fierce battle ensued between Lord Krishna and Narakasura. Narakasura fought valiantly, using his extraordinary powers, but Krishna ultimately emerged victorious. During the battle, Narakasura's mother, Bhudevi (Mother Earth), approached Krishna and requested that her son's life be spared. Krishna, known for his compassion, granted Bhudevi's request but imposed a condition. Narakasura had to ask for forgiveness and understand the consequences of his actions. Realizing the error of his ways, Narakasura surrendered to Krishna, seeking forgiveness for his sins. As a gesture of mercy, Lord Krishna not only forgave Narakasura but also granted him a boon. Narakasura requested that his death be celebrated with lights and festivity so that his memory would not be associated with darkness and evil. Celebration of Narak Chaturdashi: In commemoration of this victory of good over evil, people celebrate Narak Chaturdashi. The day typically begins with an early morning ritual bath, known as "Abhyang Snan," using oil and ubtan (a mixture of herbs) to purify the body. After the bath, people perform prayers to Lord Krishna and seek his blessings for prosperity and well-being. Homes are cleaned and decorated, and oil lamps are lit to symbolize the triumph of light over darkness. Firecrackers are burnt to express joy and drive away evil forces. Sweets and snacks are prepared and shared with family and friends. Narak Chaturdashi sets the stage for the grand festival of Diwali, which is celebrated the next day. The victory of Lord Krishna over Narakasura serves as a reminder of the importance of righteousness and the eventual triumph of good over evil. "Kaali Chaudas" is not a widely recognized term or festival in the context of Hindu celebrations. However, you might be referring to "Kali Chaudas" or "Narak Chaturdashi," which is observed on the fourteenth day of the dark fortnight of the Hindu month of Ashwin. Let me provide you with details in Hindi about the significance and celebration of "Kali Chaudas."