This text book deals with many issues of nuclear reactions in contest with the heavy-ion collisions at intermediate energies. The main issues discussed in the book are Multifragmentation, elliptical flow, nuclear stopping and symmetry energy. These phenomenas can be compared with the happenings in the universe such as Supernova Explosion, Quark Gluon Plasma, Liquid Gas Phase transition, which were the basic processes at the time of expansion of the universe. Ultimately, the study of these phenomenas has made this book highly important and interesting for the researchers as well as master students working in the field of intermediate energies. In addition to this, the determination of symmetry energy for asymmetric nuclear matter, which is the burning topic in the present day research, is also explored in the present version of the book. In conclusion, the matter published in the book will give the readers the detailed analysis of the nature of the hadronic matter, which is the ultimate goal of all the theoretical as well as experimental nuclear physics collaborations throughout the world.