The Neo-classical Theory of Relativity (NCTR) reveals the errors of Einstein's Special Theory of Relativity (STR) from many perspectives: conceptual, logical, mathematical, metrological and experimental. The main purpose of NCTR is to describe correctly the physical relations between distinct classes of physical phenomena such as inertial and electromagnetic, in a more consistent, more realistic, and more useful way than STR attempted to do. Also, NCTR defines the fundamental concepts of Physics better than STR, and it confirms the works of several physicists of the last century who showed that the absolute nature of time and the absolute frame of reference are valid concepts which can be proved experimentally and used practically.