Although there are many types of yoga practices, the Vedic literature explains that no matter which practice you choose, success is only achieved when bhakti is present. There are many yoga systems, and many yogis practicing them. Yoga means the system, and Yogi means the person who practices the system. But the ultimate goal of all yoga is to understand Krishna, the Supreme Personality of Godhead. Therefore, Krishna consciousness, or bhakti-yoga, is the topmost yoga system.