This small book written by the late Lev Artsimovich, a Full Member of the USSR Academy of Sciences, is the lecture course he delivered for the physicists interested in plasma physics. The book presents the fundamental information on the high-temperature plasma physics. These, at present largely well established results, comprise, in effect, the sum of knowledge indispensable for any physicist with a wide enough sphere of interests. By now, some material in the book has become somewhat dated; for instance, plasmas generated in Tokamaks and adiabatic traps have now more impressive parameters and we have now a markedly better understanding of the processes in them. However, since the general conceptual system has not undergone any major changes we have deemed it unwise to alter the original authorâs presentation of ideas and, therefore, no significant changes have been made in the original text. Hence, the material presented in the book comprises, in the opinion of L. Artsimovich, the fundamental results obtained through many years of experimental and theoretical research in the high temperature plasma physics.