What is Ki or Chi?

My understanding of Ki (and Chi) is that it is a name for energy, that which is created as a function of ones unwavering intention, (an individuals knowledge, born through continuous personal experience, that is without doubt and which is beyond the level associated with belief) to overcome another’s Ki (or Chi) and therefor control/affect them energetically and physically (or affect healing).
A bit metaphysical, but maybe its supposed to be, and maybe that’s why westerners don’t understand the true essence of any martial art or eastern states of “beingness”.