A fusion reactor is a type of nuclear reactor that uses heat generated by the process of nuclear fusion to produce electricity. Fusion involves combining light atomic nuclei, such as hydrogen isotopes, under extremely high temperatures and pressures to form heavier nuclei, like helium, while also releasing large amounts of energy in the form of radiation and heat. This energy can be harnessed by using it to produce steam which drives turbines connected to generators that generate electricity. Fusion reactors have the potential to provide a nearly limitless supply of clean energy with minimal radioactive waste, making them an attractive option for sustainable power generation in the future.