The general sign and general mechanism of catalytic reactions based on the transfer of electric charges to reagents has been revealed. This mechanism of catalysis is realized on the fundamental level - on the level of interaction of elementary particles (electrons and protons). The choice of this mechanism of catalysis made it possible to obtain the general law of catalysis and private laws for other types of catalysis. The main parameter in the equation of the generalized law of catalysis is the total electric charge obtained by the reactants. In catalysis, the donor-acceptor mechanism is realized, which leads to a change in the oxidation state of the reactants and to a decrease in the activation energy of the chemical reaction. The main active factor in the donor-acceptor mechanism of catalysis is the electrical charge that transfers the catalyst to the reactants. The electric charge is a quantitative characteristic in the formula for the universal law of catalysis. From the universal law of catalysis, the laws of heterogeneous, homogeneous, combined, field catalysis, and Faraday's law of electrolysis follow as private results.