The word Veda can be traced to the sanskrit word vid which means “to know” or “knowledge.” The Vedic texts contain information on varied topics: from medicine to cosmology , from techniques of yoga and meditation to explanation of lessons in governmental organisation and military protocols.
Written by Lord Vyasadeva, the vedas are divided into four books Rig Veda (earliest sacred hymns of Vedas), Sama Veda (the Vedas of melodies), Yajur Veda (Rituals) and Atharva Veda (the Vedas of incantations.). The Vedas also included Upanishads, numerous Sutras (books of concise truth) and the Vedangas (auxiliary science related with Vedic study like astronomy, astrology and phonetics.)
In addition, there are Upavedas (sciences not directly related to Vedic study) like Ayurveda (study of holistic medicine) and Gandharva-Veda study of music. It also included Puranas such as Srimad Bhagavatam and epics like as Mahabharata and Ramayanas.
According to the Vaishnava tradition, this knowledge was passed down, from master to disciple in disciplic succession or parampara.