Energy is defined as the capacity of a physical system to perform work. In other words, It can be explained as the ability to perform or complete any type of work whether it is physical or mental activity.
We can also explain “energy” which includes physical movements like shifting something from one place to another, warming something or lighting something. Energy exists in numerous forms such as heat, kinetic or mechanical energy, light, potential energy, electrical or many other forms.
It can be better described by giving the below mentioned natural example of environment, it shows a chain cycle of converting different forms of energy into heat and power: