The book discusses the latest developments in the entire field of three-dimensional free-radical polymerization, the scientific and practical aspects thereof, as well as the achievements, problems, methods used in the field, and modern development trends. The monograph is comprised of nine chapters and provides 747 references.The book is a necessary reading for both teachers and students because it connects the basics of the synthesis of cross-linked and hyper-branched polymers with their physico-mechanical properties, and concisely explains practical achievements in this branch of polymer chemistry.