Energy that flows in every living and in nature. The science of Chi control using place arrangement depending on owner/user's horoscope is
feng shui.
In Chinese tradition, good flowing of Chi makes you
healthly. When you sick, some path flows of Chi may be obstructed which can be cured (so Chi can again flow normally) using
acupuncture. However, too much flow of Chi is not good like Hurricane that can root up houses.