This lecture covers the concepts of fusion and fission, explaining the energy released in each process and the mechanisms behind them. It delves into the fusion reaction involving tritium and helium, the energy equivalence between fusion and oil, advantages of fusion energy such as high energy density and inexhaustible fuel, and the security and environmental benefits of fusion technology. The lecture also discusses plasma confinement by magnetic fields, fusion power performance, and the future prospects of fusion energy with projects like ITER and DEMO.