Chemosynthesis is a process by which certain organisms, such as bacteria and archaea, convert inorganic compounds into organic matter using chemical energy. Unlike photosynthesis, which relies on sunlight, chemosynthesis utilizes energy derived from chemical reactions, often involving substances like hydrogen sulfide or methane. This process is crucial in environments where sunlight is not available, such as deep-sea hydrothermal vents. Organisms that perform chemosynthesis play a vital role in their ecosystems by forming the base of the food chain. They provide energy and nutrients for other organisms, including tubeworms and clams, which depend on these primary producers for survival in extreme environments.