Hydrogen is the most abundant element that exists in the universe. Both the sun and the stars are composed mainly of hydrogen. It is a very light gas that is colourless, odourless, and tasteless. It can be used as a source of energy.
In Europe, it makes up less than 2% of our current energy consumption and is mostly used for the development of complex chemical products. Hydrogen is a fuel that produces only water and is an important element of the EU's strategy for energy system integration.