Why are the Mahābhārata and Rāmāyaṇa described as epics?

The Mahābhārata and Rāmāyaṇa are described as epics because they are long, narrative poems that tell grand stories of heroism, morality, and the struggle between good and evil. According to the class 6th social science NCERT, these epics are not only central to Indian literature but also reflect the cultural values, social norms, and spiritual ideas of ancient India. They include detailed characters, significant events, and moral dilemmas, which serve to teach lessons about duty, righteousness, and justice. Their large-scale impact on literature, religion, and culture makes them monumental works of Indian tradition.

This question related to Chapter 8 Social Science Class 6th NCERT.
From the Chapter 8. Unity in Diversity, or Many in the One.
Give answer according to your understanding.