What is the difference between a fuel cell vehicle and a hydrogen engine car?

Hydrogen everywhere

Speaking of hydrogen, fuel cell vehicles (FCVs) are recalled, but what is now being talked about is a hydrogen engine that uses hydrogen as fuel.ROOKIE RACING announced that it will participate in the "Super Endurance (S Furestation) Series 2021 Round 3 Fuji 24 Hours Race" starting on May 21, and will participate in a vehicle with a hydrogen engine based on "Corolla Sports".It is attracting attention to what kind of run it is.At the moment, Toyota says he has no plans to sell hydrogen engine vehicles, but I would like to think about whether there is a possibility in the future and if it is commercially available.

Hydrogen (H) is the largest element in the universe and is common on earth, mostly found as water (H2O).Hydrogen is indispensable for the human body, and it exists in the form of water and various compounds in the body, and hydrogen accounts for about 10 % in mass ratio.

From a mobility perspective, hydrogen is light, reacientious, and theoretically, it can be said that it is a clean energy source that does not produce carbon dioxide (CO2), but these features are technically developed.It can also be an issue.Let's look individually.