The process by which plants produce food using sunlight is called photosynthesis. During photosynthesis, plants convert carbon dioxide from the air and water from the soil into glucose (a form of sugar) and oxygen, utilizing sunlight as energy. This process occurs primarily in the chloroplasts of plant cells, which contain chlorophyll, enabling the absorption of sunlight. Photosynthesis is crucial for sustaining life on Earth, as it provides oxygen for animals and humans to breathe and serves as the foundation of the food chain, supplying energy for all living organisms.