Pongal is celebrated to express gratitude to the Sun God and Rain, for a good harvest of this year.

The economy of Tamil Nadu (a rice-growing state) is heavily dependent on a good harvest and hence, the celebration of Pongal.
The harvest festival of Tamil Nadu, Pongal is celebrated every year till on 14 January. It is a four-day festival, the last day over with Makar Sankranti.
Pongal is a four-day auspicious harvest festival. The first day is for special prayers to the rain God. pray to bonfire in the evening, dedicated to Lord Krishna.

The Sun God is worshipped on the second day of Pongal. It is known as Surya Pongal. On that day People boil rice in milk in an earthen pot and offer it to the idol of the Sun God, for his never ending light.

Cow worship is done on the third day of the pongal festival, known as Mattu Pongal. People tie decorate their cattle and seek their blessings because they help into farming.

The last day, fourth day of Pongal or Kannum Pongal is reserved by women praying for the prosperity and well-being of their home and their spouse. Women perform auspicious rituals and pray by placing rice on a turmeric leaf and performing aarti.