Fusion reactions occur when two atomic nuclei combine to form a heavier nucleus, releasing large amounts of energy. The process of nuclear fusion is what powers the sun and the stars.

Nuclear reactors are devices that control and sustain fusion reactions. The most common type of nuclear reactor is the tokamak, which uses a magnetic field to confine the fusion fuel, or plasma.

In a tokamak, the plasma is heated to extremely high temperatures, causing the nuclei of the atoms in the plasma to move faster and collide with each other with enough force to fuse. The fusion reactions release energy in the form of heat, which can be used to generate steam and drive a turbine to produce electricity.

Building and operating nuclear fusion reactors requires complex technology and materials that can withstand the extreme heat and radiation produced by fusion reactions. Despite the challenges, scientists and engineers continue to work on developing fusion power as a clean, safe, and potentially limitless source of energy for the future.