Abstract
After a brief historical introduction, dealing with the development of the neutrino concept and the search for the free neutrino, the main properties of the various kinds of particles and antiparticles of the neutrino group ( nu e, nu mu , nu e, nu mu ) are listed. The article deals further only with the electron neutrinos nu e which are produced in the solar interior as a by-product of the thermonuclear reactions of hydrogen. An outline of the p-p chain and CNO cycle reactions inside the Sun is given, with the emphasis on the role of various branches of these processes in producing sufficiently energetic neutrinos which could be detected by Davis's method.

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