In Traditional Chinese Medicine (TCM), "chi" or "qi" is the invisible life force or vital energy that flows through all living things. It is thought to be inherited and also derived from food and air.
Central to Taoist world-view and practice is qi (chi). Qi is life-force -- that which animates the forms of the world. It is the vibratory nature of phenomena -- the flow and tremoring that is happening continuously at molecular, atomic and sub-atomic levels. In Japan it is called “ki,” and in India, “prana” or “shakti.” The ancient Egyptians referred to it as “ka,” and the ancient Greeks as “pneuma.” For Native Americans it is the “Great Spirit” and for Christians, the “Holy Spirit.” In Africa it’s known as “ashe” and in Hawaii as “ha” or “mana.” In New Zealand the native Maori call it "wairua".
Qigong is a practice of aligning breath, movement, and awareness for exercise, healing, and meditation.With roots in traditional Chinese medicine, martial arts, and philosophy, qigong is traditionally viewed as a practice to balance (chi) or what has been translated as "intrinsic life energy." Typically a qigong practice involves rhythmic breathing, coordinated with slow stylized repetition of fluid movement, and a calm mindful state. Qigong is now practiced throughout China and worldwide, and is considered by some to be exercise, and by others to be a type of altenative medicine and meditative practice. From a philosophical perspective qigong is believed to help develop human potential, allow access to higher realms of awareness, and awaken one's "true nature."
Tao - the way
Taoism is an Eastern religion/philosophy with perhaps 225 million followers. Although it is more accurately referred to as a philosophy, books on world religions inevitably include it with other religions from Buddhism to Zoroastrianism.