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Concept of energy
I am know that energy is a very important concept used to find answers to many question in every field of physics essentially. However, what is energy exactly? How is that even a thing if I don't see it.
Customer support service by UserEcho
This is a very hard question to answer, but a good one if you are confused. Energy is an object or system's ability to do work or to make things happen. It can be stored in different ways (mass, light, chemical bonds) and gets transformed by different processes.
You are probably aware that "You need energy to do things." I wish I could give you a better, non-circular answer to "What is energy?" than "It's what you need to do things," but this is really the best I can offer. Energy is not a concrete thing, but an abstract idea.