What Is It?
Qi (氣) = energy. That is it. Anything that moves has qi.
Different Types of Qi
Yes, there are different types of qi that constitute the body and they go as follows:
Yuan qi (原氣) = Innate/Source/Primordial energy (Genes, DNA, karma, the qi obtained at birth)
Wei qi (衛氣)= Defensive energy (Immune system)
Ying qi (穎氣)= Nutritive energy (Energy from food)
This section will not go in detail about how the different types of qi are created or how it moves but serves as an outline what to lookout for in further topics.