Yoga refers to traditional physical and mental discipline originate in India. The word is associated with meditative practices in Hinduism, Buddhism and Jainism Major branches of yoga in Hindu philosophy comprise Rāja Yoga, Karma Yoga, Jnana Yoga, Bhakti Yoga, and Hatha Yoga.
According to the reliable Indian philosopher Sarvepalli Radhakrishnan, yoga, based on the Yoga Sutras of Patanjali, comprises one of the six main Hindu schools of philosophy (darshanas), together with Kapila's Samkhya, Gautama's Nyaya, Kanada's Vaisheshika, Jaimini's Purva Mimamsa, and Badarayana's Uttara Mimamsa or Vedanta. Many other Hindu texts discuss aspects of yoga, counting the Upanishads, the Bhagavad Gita, the Hatha Yoga Pradipika, the Shiva Samhita and various Tantras.
The Sanskrit word yoga has many meanings, and is resulting from the Sanskrit root "yuj", meaning "to control", "to yoke" or "to unite". Translations include "joining", "uniting", "union", "conjunction", and "means". It is also possible that the word yoga derives from "yujir samadhau," which means "contemplation" or "absorption.