Energy
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
Energy is the capacity of a system to supply heat or to do work on its surroundings.
Show
Inflating a bicycle tire by hand does work, since the pump moves air against the pressure already inside the tire.
Watch for
"Energy" names a capacity to act, not a substance stored in one fixed location inside an object.