Hydrogen is a diatomic, nonmetallic, highly combustible gas that is colorless, odorless, and tasteless. It has the highest energy content per unit of weight of any known fuel, making it a key component in transportation and energy production, as well as in various industrial processes such as ammonia production and electronics manufacturing. Hydrogen can be produced from a variety of sources, including natural gas, water, and biomass, and it has the potential to significantly reduce greenhouse gas emissions when used in fuel cells to power vehicles and other equipment.