Dhanteras, also known as Dhanatrayodashi, is a Hindu festival celebrated in India and Nepal. It falls on the thirteenth day of the dark fortnight in the month of Kartik, which usually falls in October or November.

The word "Dhanteras" is derived from two words: "Dhan", which means wealth or money, and "Teras", which means the thirteenth day. On this day, people worship Goddess Lakshmi, who is the goddess of wealth and prosperity, and Lord Kubera, who is the god of wealth. It is believed that worshipping these deities on Dhanteras brings prosperity and good luck to one's home and business.

People celebrate Dhanteras by buying gold or silver ornaments or utensils, as it is considered auspicious to do so on this day. They also light diyas (lamps) and perform puja (worship) in their homes. Some people also perform Lakshmi puja in the evening, which involves offering flowers, sweets, and other items to the goddess.

Overall, Dhanteras is a festival that celebrates wealth and prosperity, and is considered an important day for business owners and traders. It is also the first day of the five-day Diwali festival in India.