Difference between tai chi and qigong

I am often asked, "What is the difference between tai chi and qigong?" To keep things clear and simple, I like to think of qigong as the bigger realm of practice which encompasses tai chi. To me, tai chi is a qigong practice. Why?
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Qi refers to the essence or energy that is within and sustains life. Gong means to work or cultivate. Whether we practice separate movements or a tai chi form, which is a sequence of movements strung together, we are working and cultivating Qi from within. Our vitality and sense of well-being will increase with regular practice.

The term tai chi really is a term used in the explanation of the Taoist (Daoist) theory of creation. Adding chuan (quan) refers to the martial practice of tai chi chuan (taijiquan) because chuan translates as fist. When I teach tai chi, I am teaching the 64 posture Guang Ping Yang Style Form. Other movements and postures I teach are referred to as qigong. This is my own take on the matter.

The Guang Ping Form I teach has great martial potential, even though my focus for teaching this form is for cultivating Qi and for relaxation, mindfulness and a greater sense of well-being.