Answer;
Carrier; source
While hydrogen energy holds promise, the fact is that hydrogen is an energy carrier, not a primary energy source.
Step-by-step explanation;
Hydrogen can be considered as a clean energy carrier similar to electricity.
Hydrogen can be produced from various domestic resources such as renewable energy and nuclear energy.
It is considered as a secondary source of energy, commonly referred to as an energy carrier. Energy carriers are used to move, store and deliver energy in a form that can be easily used.