Raja Yoga the Yoga of Meditation

Yoga falls into four categories. The first, being the yoga of devotion, is termed ?bhakti yoga.? The second, being yoga of service, is termed ?karma-yoga.? The third, being yoga of wisdom, is termed ?jnana-yoga.? And the fourth, being yoga of meditation, is termed ?raja-yoga.? There are, of course, other forms of yoga that are accessories to the four main categories. What we are concerned with here is raja-yoga.