Question

what is energy?
define it.....

Answer 1

$hey \: dear \: here \: is \: your \: answer$
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ENERGY : capacity of doing work by a body is called its energy. Energy is a scalar quantity amd it's unit is joule.

☺$hope \: this \: helps \: you \:$
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Answer 2

Energy → the capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other various forms. There are, moreover, heat and work—i.e., energy in the process of transfer from one body to another.

Hope it helps u.