The present status of inertial-confinement fusion (ICF) with the help of ion beams, in particular, beams of light particles, is reviewed. The basic requirements which such beams must meet for a demonstration experiment are formulated; the basic trends in the development of the technological base and the optimal types of diodes operating at the multiterawatt level are studied; the problems of obtaining a uniform plasma on the surface of the anode, reducing the beam divergence angles, beam transport and beam focus on the target, alternative schemes for generating PIB, including acceleration in successive sections, and the use of plasma erosion commutators are analyzed.