Switching from internal combustion engines (ICE) to hydrogen fuel cells is a bit like moving from a noisy, vibrating furnace to a silent, chemical power plant. While both take fuel and turn it into motion, the "how" and the "why" are worlds apart.
In a standard engine, you’re exploding fuel to push a piston. In a hydrogen fuel cell, there is no fire. Instead, it uses an Electro-Chemical process to strip electrons from hydrogen atoms to create electricity, which then powers an electric motor.