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The manifold aspects of plasma physics are briefly described. The basic science and advanced technology embodied in this interdisciplinary field are delineated following an identification of what constitutes a plasma. With regard to the former, such highlights as the evolution of the method of adiabatic invariants to deal with highly nonlinear properties of plasmas are offered. Hypersonics, high impulse fuel systems, the Sherwood program, nuclear explosives, and microwave tubes represent key areas in modern technology demanding more basic knowledge of plasma interactions.