Vedas has a great influence on ancient Indian society and this Vedas become a crucial part of forming the Sanatan dharma. Though the knowledge of Vedas was always there, Rishi Vyasa compiled the divine knowledge into four Vedas and passed orally a thousand years ago. 

There are four major Vedas:

 - Rigveda 

 - Samaveda 

 - Yajurveda

 - Atharvaveda

Rigveda: According to scholars and sages, Rigveda is one of the oldest and perplexing literature ever written. Rigveda consists of explanation of the origin of the world, power of God, and art of living.

Samaveda: Samaveda is similar to Rigveda, but it is written to form the set to music. Samaveda is the Veda of melodies, this is the oldest music organization in the world that contains all kind of music. 

Yajurveda: Yajurveda is all about religious rituals.  It said to be step by step guide to explain the right way of performing religious ceremonies and rituals. 

Atharvaveda: Atharva Veda contain the secret of good and long life, good health, and how to make god in our favor. 

Vedas also contain ancient science that’s proven by today’s modern science. i.e. moon is enlightening by the sun, the theory of rotation, the big bang theory that’s all already exists in our Vedas.