  Some general considerations on the notion of entropy in physics are
presented. An attempt is made to clarify the question of the differentiation
between physical entropy (the Clausius-Boltzmann one) and quantities called
entropies associated to Information Theory, which are in fact generating
functionals for the derivation of probability distributions and not
thermodynamic functions of state. The role of them in the construction of the
so-called Unconventional Statistical Mechanics, and the meaning and use of the
latter, is discussed. Particular attention is given to the situation involving
far-from-equilibrium systems.
