Quantity specifying the amount of disorder or randomness in a system bearing Energy or information. In Thermodynamics, entropy indicates the degree to which a given quantity of thermal energy is
available for doing useful Work - the greater the entropy, the less available the energy. According to the
second law of thermodynamics, during any process the change in entropy of a
system and its surroundings is either zero or positive, meaning the system can’t do more work after going through a process than before. Thus, the entropy
of the universe as a whole tends towards a maximum. In information theory
entropy represents the Noise (see Interference), or random errors, occurring in the transmission of signals or messages.