Fuel cell electric vehicles are a cool new way to power cars without burning fossil fuels. They use hydrogen in fuel cells to make electricity that drives the vehicles. This is super eco-friendly because it doesn't make greenhouse gases. Fuel cells are different from regular batteries because they keep making power if you keep giving them fuel. The study looked at how fuel cell electric vehicles work and explained why they're a big deal for our future transportation. It's like a guide that helps everyone, from drivers to scientists, understand how these vehicles are key players in our goal for sustainable transportation.