The carbon cycle is the natural process through which carbon is exchanged among the atmosphere, land, water, and living organisms. Carbon exists in various forms, including carbon dioxide (CO2) in the air, organic matter in plants and animals, and fossil fuels underground. Through processes like photosynthesis, plants absorb CO2 and convert it into organic compounds, which are then consumed by animals. When living organisms respire, decompose, or when fossil fuels are burned, carbon is released back into the atmosphere as CO2. This cycle is essential for maintaining the balance of carbon in the environment, supporting life, and regulating the Earth's climate.