The primary source of energy for thermophiles is derived from chemical reactions that involve the oxidation of inorganic compounds, often in extreme heat environments. These extremophiles, such as certain bacteria and archaea, typically utilize hydrogen sulfide, methane, or other sulfur compounds as energy sources. Some thermophiles also engage in chemosynthesis, converting inorganic molecules into organic matter. Their unique metabolic pathways enable them to thrive in high-temperature habitats, contributing to our understanding of life's adaptability and providing insights into potential biotechnological applications.