Hydrogen gas is the simplest and most abundant element in the universe, consisting of just one proton and one electron. It is colorless, odorless, and tasteless, making it difficult to detect without specialized equipment. Hydrogen is highly flammable and can be used as a fuel source, often in the form of hydrogen fuel cells that convert it into electricity. In nature, hydrogen is usually found combined with other elements, such as in water (H2O) or hydrocarbons. It can be produced through various methods, including electrolysis of water and steam reforming of natural gas. As a clean energy source, hydrogen has the potential to reduce greenhouse gas emissions when used in place of fossil fuels.