A fuel cell is a device that converts chemicals into electricity without pollution. This clean energy can be used to power cars, homes, and businesses--anything that uses electricity. A fuel cell is similar to a battery, but fuel cells don't go "dead"--they just need to be refilled. Fuel cells may be the future of energy, providing a clean alternative to burning fossil fuels. There is still work to be done before fuel cells will be practical for everyday use, but many scientists are working to produce safe, cost-effective fuel cells to power our world.