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ENTROPY
entropy, symbolized by S, is a measure of the unavailability of a system’s energy to do work.
Entropy is a function of a quantity of heat which shows the possibility of conversion of that heat into work.
In science, the term "entropy" is generally interpreted in three distinct, but semi-related, ways, i.e., from macroscopic viewpoint (classical thermodynamics), a microscopic viewpoint (statistical thermodynamics), and an information viewpoint (information theory).
The statistical definition of entropy is the fundamental definition because the other two can be mathematically derived from it, but not vice versa. All properties of entropy (including second law of thermodynamics) follow from this definition.