Hydrogen is the most abundant element in the universe. However, on Earth you find it combined with other elements, not in its free form. Some of this combinations are oxygen resulting on water (H2O), carbon forming hydrocarbons, or with other elements forming an infinity of different compounds.
Hydrogen is a versatile energy vector that does not pollute because it carries energy that can be liberated in a controlled way. In addition, with hydrogen you can obtain heat and electricity.
Hydrogen will be a key role for the energetic transition due to: