Chemoautotrophs are organisms that obtain energy by oxidizing inorganic substances, such as hydrogen sulfide or ammonia. They use this energy to convert carbon dioxide into organic compounds, allowing them to produce their own food. This process is essential in environments where sunlight is not available, such as deep-sea hydrothermal vents. These organisms play a crucial role in ecosystems by supporting food webs in extreme environments. Bacteria and archaea are the primary groups of chemoautotrophs, and they contribute to nutrient cycling and the overall health of their habitats. Their unique metabolic processes help sustain life in places where other organisms cannot thrive.