The major epics of the Sangam age are Silappadikaram, Manimekhalai, Jivak Chintamani, Valayapati, and Kundalakasi. These epics hold great significance in Tamil literature and provide valuable insights into the social, cultural, and political aspects of the Sangam era.

1. Silappadikaram:
Silappadikaram, also known as "The Tale of an Anklet," is one of the most renowned epics of the Sangam age. It was composed by Ilango Adigal and revolves around the story of Kannagi, a virtuous woman who seeks justice for her husband's wrongful execution. The epic beautifully portrays the themes of love, justice, and the consequences of human actions.

2. Manimekhalai:
Manimekhalai is another important epic from the Sangam age, written by the poet Sattanar. It focuses on the life of Manimekhalai, a young dancer who ultimately renounces worldly pleasures to pursue the path of spirituality. The epic explores the themes of desire, morality, and the search for enlightenment.

3. Jivak Chintamani:
Jivak Chintamani is an epic composed by Tirutakkatevar. It narrates the story of Prince Jivaka, a renowned physician in the court of King Udayana. The epic delves into themes of medicine, ethics, and the importance of compassion in healing.

4. Valayapati:
Valayapati, authored by Nakkirar, is a heroic epic that tells the story of the valor and bravery of King Valayapathi. It highlights the king's military conquests and his efforts to protect his kingdom.

5. Kundalakasi:
Kundalakasi, written by Nakkirar, is a romantic epic that follows the story of Kundalakesi, a courtesan who falls in love with a Buddhist monk. The epic explores themes of love, morality, and the conflict between worldly desires and spiritual pursuits.

These epics are significant as they provide profound insights into the society, culture, and values of the Sangam age. They reflect the diverse range of themes and genres prevalent during that time, including love, heroism, morality, and spirituality. The epics not only serve as literary masterpieces but also shed light on the historical and social context of the Sangam era, making them invaluable sources for understanding ancient Tamil civilization.