The word "yoga" comes from the Sanskrit root yuj, which means "to unite". Yoga means the union of the individual soul with the universal consciousness.
It has been defined as a practice of devotion toward God, solely motivated by the sincere, loving desire to please God, rather than the hope of divine reward or the fear of divine punishment. Bhakti yoga is often considered by Hindus to be the easiest way for ordinary people to attain a spiritually liberated state, because although it is a form of yoga, its practice is not as rigorous as most other yogic schools, and it is possible to practice bhakti yoga without needing to become a full-time yogi. The origins of Bhakti can be seen in the upanishads, specifically the Shvetashvatara Upanishad. The Bhagavad Gita, and the Puranas are important scriptures that expound the philosophy of bhakti yoga. Hindu movements in which bhakti yoga is the main practice are called bhakti movements – the major schools of which are Vaishnavism, Shaivism, and Shaktism.
Gyana means knowledge. Gyana Yoga is the path where reality is discovered through insight, practice and knowledge. Viveka - Discrimination Viveka is the purest form of knowledge. It can also be described as the supreme authority of our conscience. Vairagya - Renunciation Vairagya means to liberate oneself inwardly from any desire for earthly pleasure or possessions.