Hidrojen, or hydrogen, is the simplest and most abundant chemical element in the universe. It is represented by the symbol H and has an atomic number of 1. As a colorless, odorless gas at room temperature, hydrogen plays a crucial role in various chemical reactions, including the formation of water when it combines with oxygen. In addition to its natural occurrence, hydrogen is used in various industries, such as petrochemicals and fertilizers. It is also gaining attention as a clean energy source, as it can be used in fuel cells to produce electricity without harmful emissions, making it a key player in the transition to sustainable energy.