Jnâna yoga (Devanāgarī: ज्ञान योग; the pronunciation can be approximated by “dny-ah’-nuh y-O’-guh”) or “path of knowledge” is one of the types of yoga mentioned in Hindu philosophies. Jnâna in Sanskrit means “knowledge”.
As used in the Bhagavad Gita, the Advaita philosopher Adi Shankara gave primary importance to jnâna yoga as “knowledge of the absolute” (Brahman), while the Vishishtadvaita commentator Ramanuja regarded knowledge only as a condition of devotion. In the Bhagavad Gita (13.3) Krishna says that jnâna consists of properly understanding kshetra (the field of activity–that is, the body) and kshetra-jna (the knower of the body–that is, the soul). Later in the Gita (13.35) Krishna emphasizes that a transcendentalist must understand the difference between these two.
Definition courtesy Wikipedia.