The Vedas are the oldest and most authoritative Hindu sacred texts originating in ancient India. They are written in Sanskrit and consist of four main texts - the Rigveda, Yajurveda, Samaveda, and Atharvaveda. The Rigveda contains hymns praising Vedic gods like Agni and Indra. The Samaveda contains melodies and chants primarily derived from the Rigveda. The Yajurveda describes religious rituals and ceremonies. The Atharvaveda consists of spells and charms and provides insights into Vedic society.