Fission energy is the process of splitting the nucleus of an atom into smaller parts, releasing a significant amount of energy. This reaction typically involves heavy elements like uranium or plutonium. When the nucleus splits, it produces two smaller nuclei, along with neutrons and energy in the form of heat. This heat can be harnessed to generate electricity in nuclear power plants. The released neutrons can also trigger further fission reactions, creating a chain reaction that sustains energy production. Fission energy is a powerful source of electricity but also raises concerns about safety and radioactive waste management.