Hydrogen Fuel Cell Cars
Hydrogen cars run hydrogen gas, but unlike other "fuels", the hydrogen is not actually burned. When hydrogen reacts with oxygen, it produces water, and gives off energy. A fuel cell is able to capture the energy from this reaction, and convert it to electric power, which powers a motor. The hydrogen is made from a process called electrolysis, which is done by applying an electric current to water. This process uses quite a lot of electricity, and so in a way, hydrogen is just like a battery, which is charged initially using electricity, and then it powers a motor.
Hydrogen can be made and then stored, so it is possible to refuel, rather than having to plug your car in overnight. Hydrogen also stores a lot of energy, so longer distances would be possible compared to a battery, but the process of creating and using hydrogen is less efficient than charging and discharging a battery is. Hydrogen vehicles also lack refuelling stations, and have quite a ways to go before the technology is completely usable and affordable.