Hatha Yoga is traditionally defined as a part of Raja Yoga. It is comprised of the terms Ha (sun) and Tha (moon). Hatha Yoga is meant to balance the energy flow in the body, ignite the life energy or prana through breathing exercises and postures, and eventually lead to the kindling of the Kundalini energy, which is said to lie dormant at the base of the spine. When Hatha Yoga is practiced fully, it becomes the real Kundalini Yoga.
Hatha Yoga has six components: Ethical guidelines (yama and niyama), postures (asana), breath or energy control/expansion (pranayama), energy locks (bandhas) and six cleansing techniques (shat kriyas).