Yoga is an Indian physical, mental, and spiritual practice or discipline. There is a broad variety of schools, practices and goals in Hinduism, Buddhism and Jainism.

The origins of Yoga have been speculated to date back to pre-Vedic Indian traditions.

The term “yoga” has been applied to a variety of practices and methods. The well-known Hindu schools of Yoga being Jnana Yoga, Bhakti Yoga, Karma Yoga, Laya Yoga and Hatha Yoga, but also including Jain and Buddhist practices. Yoga Sutras of Pantajali, constitute classical Ashtanga Yoga (the eight limbs), also called Raja Yoga.

Yoga is derived from ‘Yog’ in Hindi. Yog has many meanings in hindi like the mathematical operation of addition or join or providence.

On December 11, 2014, The 193-member U.N. General Assembly approved by consensus, a resolution establishing June 21 as ‘International Day of Yoga’.

source: https://en.wikipedia.org/wiki/Yoga