Pongal is a four-day harvest festival celebrated in the southern Indian state of Tamil Nadu, and parts of Andhra Pradesh, Karnataka, and Puducherry. It is typically celebrated on January 14th, which coincides with Makar Sankranti, a festival celebrated across India to mark the transition of the sun into the zodiacal sign of Makara (Capricorn).

The festival is dedicated to the sun god, Surya, and to the Hindu god of agriculture, Lord Indra. It is celebrated to thank them for a good harvest and to seek blessings for future crops.

The main day of Pongal is known as "Thai Pongal," which is celebrated on the first day of the Tamil month of Thai (January-February). On this day, people prepare a sweet dish called Pongal, which is made from newly harvested rice, lentils, and jaggery. This dish is then offered to the gods as a form of thanksgiving.

On the second day of Pongal, people participate in a bull-taming event called "Jallikattu," in which young men attempt to tame and control a bull. This event is considered a symbol of strength and courage.

On the third day of Pongal, called "Mattu Pongal," farmers honor and worship their cattle, which are considered vital for the success of their crops.

The fourth day, "Kaanum Pongal," is a day for families to get together and visit each other, and for young people to exchange gifts and enjoy traditional games.

Pongal is celebrated with great enthusiasm and joy, with people decorating their homes, preparing traditional foods, and participating in various cultural events and activities. It is considered as a festival of unity and brotherhood, and people from all walks of life, regardless of their caste, religion, or social status, participate in the celebrations.