Hydrodeoxygenation is a big word that describes a process where we take things that are not useful for us and make them useful. It's like making a yummy cake from ingredients that are not tasty on their own, like flour and eggs.
But instead of flour and eggs, we use something called biomass which comes from plants like corn or trees. However, these plants have a lot of oxygen inside them, which we don't need. So we use a special method called Hydrodeoxygenation to remove the oxygen.
Think of it like taking the yucky parts out of your food to make it taste better. We use some chemicals to change the plants into smaller, more useful pieces called biofuels. These biofuels are a lot better for our environment because they don't make as much pollution as regular fuels.
In summary, Hydrodeoxygenation is a process where we use plants to make something useful, and we remove the parts that we don't need so that it's better for our environment.