Vyasa was a very wise man in ancient times. He was very good at telling stories and he wrote down a lot of very important books, like the Mahabharata and the Puranas.
He was also very important in Hindu religion because he was one of the people who wrote down the Vedas, which are really old holy texts that the Hindus follow.
So basically, Vyasa was a really smart guy who wrote down lots of really important stories and holy texts that people still read and follow today.