The document provides an overview of classical yoga, including its major divisions and philosophical underpinnings. It discusses Patanjali's Yoga Sutras and the eight limbs of yoga. It then summarizes the four major paths (yogas) of classical yoga - Raja Yoga, Jnana Yoga, Karma Yoga, and Bhakti Yoga. The rest of the document delves into the philosophical frameworks of Samkhya and Vedanta that inform yoga. It also explains concepts like the five koshas or sheaths and the three gunas that are part of yoga philosophy.