Nuclear fusion is a process where two light atomic nuclei combine to form a heavier nucleus, releasing a significant amount of energy in the process. This reaction powers the sun and other stars, making it a fundamental process in the universe. Scientists are researching ways to harness fusion for clean and virtually limitless energy on Earth. Unlike nuclear fission, which splits heavy atoms, fusion has the potential to produce energy with minimal radioactive waste. Projects like ITER aim to demonstrate the feasibility of fusion as a practical energy source, potentially revolutionizing how we generate electricity in the future.