Nuclear reactions are processes in which the nuclei of atoms interact and transform into different nuclei, releasing a large amount of energy in the process. These reactions are responsible for the energy production in stars, nuclear power plants, and can also be used in nuclear weapons. The study of nuclear reactions involves understanding the mechanisms by which nuclei interact and the characteristics of the particles and energy released during the reactions. This research area is important for advancing our knowledge of nuclear physics, developing new energy sources, and exploring the fundamental forces that govern the behavior of subatomic particles.