Entropy Law is the second Law of Thermodynamics, a law which motivates all real-world change or dynamics. With a very wide range of applicability, the laws of Thermodynamics can be applied to cosmology, history, economics, development of institutions, military, nuclear fission and to almost everything.
 What is Entropy?
The first law of Thermodynamics is the "law of conservation". Under the second law of thermodynamics whenever there is energy transformation from one state to another, there is a loss in the amount of that form of energy, which becomes available to perform work of some kind. The loss in the amount of ‘available energy’ is known as ‘entropy’.