Ved Vyaas, or Baadaraayan, or Krishna Dwaipaayan divided the Veda in four parts and taught them to his four disciples for the ease of learning, remembering and teaching to other people. Pail, Vaishampaayan, Sumantu, and Jaimini. Since Vyaas expanded the Gyaan (knowledge) among the people so much, that is why he is known as the incarnation of knowledge also. Whenever the Dharma is destroyed from the Earth, Bhagvaan incarnates on the Earth. Incarnation is of four types - (1) Nityaavataar - He is present here all the time in the form of Saadhu, Sant (saints) and great Rishi. That is His Nityaavataar. (2) Anshaavataar - He incarnates in this form just to fulfill only one work, such as Matsya Avataar , Varaah Avataar , Vaaman Avataar , Mohinee Avataar etc. (3) Aaveshaavataar - He incarnates in this form for His Bhakt when he is in trouble, such as Narasinh Avataar (4) Poorn Avataar - He incarnates in this form when He has to do all the above three works - to protect Saadhu, destro