In the first part of the review we expound in detail the unified theory of weak and electromagnetic interactions of Glashow, Weinberg and Salam In the second part, on the basis of this theory a number of the neutral current induced processes are discussed We consider in detail the deep inelastic scattenng of neutnnos on nucleons, the P-odd asymmetry in the deep inelastic scattering of longitudinally polarized electrons by nucleons, the scattenng of neutnnos on electrons, the elastic scattenng of neutnnos on nucleons, and the electron-positron annihilation into leptons