Traditionally, Hindus ascribe the authorship of the Mahabharata to Vyasa. The first section of the Mahabharata states that it was Ganesha who, at the request of Vyasa, wrote down the text to Vyasa's dictation. Ganesha is said to have agreed to write it only on condition that Vyasa never pause in his recitation. Vyasa agreed, providing that Ganesha took the time to understand what was said before writing it down. This also serves as a popular variation on the story of how Ganesha's right tusk was broken (a traditional part of Ganesha imagery). This version attributes it to the fact that, in the rush of writing, his pen failed, and he snapped off his tusk as a replacement in order that the transcription not be interrupted.

The epic employs the story within a story structure, otherwise known as frametales, popular in many Indian religious and secular works. It is recited to the King Janamejaya who is the great-grandson of Arjuna, by Vaisampayana, a disciple of Vyasa.

With more than 74,000 verses, the Mahabharata is one of the longest epic poems in the world. Including the Harivamsa, the Mahabharata has a total length of more than 90,000 verses. It is of immense importance to the culture of the Indian subcontinent, and is a major text of Hinduism. Its discussion of human goals (artha or purpose, kama or pleasure, dharma or duty, and moksha or liberation) takes place in a long-standing tradition, attempting to explain the relationship of the individual to society and the world (the nature of the 'Self') and the workings of karma.

The Mahabharata is more than simply a story of kings and princes, sages and wise men, demons and gods. The Mahabharata includes aspects of Hinduism, stories of the gods and goddesses, and explanations of Hindu philosophy.

The core story of the work is that of a dynastic struggle for the throne of Hastinapura, the kingdom ruled by the Kuru clan. The two collateral branches of the family that participate in the struggle are the Kaurava and the Pandava. Although the Kaurava is the senior branch of the family, Duryodhana, the eldest Kaurava, is younger than Yudhisthira, the eldest Pandava. Both Duryodhana and Yudhisthira claim to be the first in line to inherit the throne.

The struggle culminates in the great battle of Kurukshetra, in which the Pandavas are ultimately victorious. The battle produces complex conflicts of kinship and friendship, instances of family loyalty and duty taking precedence over what is right, as well as the converse.

The Mahabharata itself ends with the death of Krishna, and the subsequent end of his dynasty, and ascent of the Pandava brothers to heaven. It also marks the beginning of the Hindu age of Kali (Kali Yuga), the fourth and final age of mankind, where the great values and noble ideas have crumbled, and shows that man is heading toward the complete dissolution of right action, morality and virtue.