Major branches of yoga in Hindu philosophy include Raja Yoga, Karma Yoga, Jnana Yoga, Bhakti Yoga, and Hatha Yoga. Raja Yoga, compiled in the Yoga Sutras of Patanjali, and known simply as yoga in the context of Hindu philosophy, is part of the Samkhya tradition. Many other Hindu texts discuss aspects of yoga, including Upanishads, the Bhagavad Gita, the Hatha Yoga Pradipika, the Shiva Samhita and various Tantras.

The Sanskrit word yoga has many meanings, and is derived from the Sanskrit root "yuj," meaning "to control," "to yoke" or "to unite." Translations include "joining," "uniting," "union," "conjunction," and "means." Outside India, the term yoga is typically associated with Hatha Yoga and its asanas (postures) or as a form of exercise. Someone who practices yoga or follows the yoga philosophy is called a yogi or yogini.
source: http://en.wikipedia.org/wiki/Yoga
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