The Vedas are a collection of religious texts that are considered the oldest scriptures of Hinduism. They originated in ancient India and were composed in Vedic Sanskrit. The term "Veda" means "knowledge" and the texts are divided into four main categories: the Rigveda, the Yajurveda, the Samaveda, and the Atharvaveda. Each Veda has four subdivisions: the Samhitas (mantras and benedictions), the Aranyakas (text on rituals, ceremonies, sacrifices, and symbolic-sacrifices), the Brahmanas (commentaries on rituals, ceremonies, and sacrifices), and the Upanishads (texts discussing meditation, philosophy, and spiritual knowledge). Some scholars add a fifth category, the Upasanas (worship). The Vedas are considered Shruti ("what is heard"), distinguishing them from other religious texts, which are called Smriti ("what is remembered"). The Vedas contain hymns, mythological accounts, poems, prayers, and formulas considered sacred to the Vedic religion. The Vedas are still regarded as highly important by orthodox Hindus, and the works continue to be chanted and sung by those who still recognize in them the mystery of an inexpressible truth offered without easy explanation.