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 mechanism of energy production in the universe. Scientists are working to harness fusion on Earth as a clean and virtually limitless energy source. In nuclear fusion, conditions must be extreme, with high temperatures and pressures to overcome the repulsive forces between positively charged nuclei. Research facilities like ITER aim to create controlled fusion reactions, potentially revolutionizing energy production and reducing reliance on fossil fuels.