Photosynthesis is a biochemical process used by green plants, most algae, and cyanobacteria to capture energy from sunlight and convert it into chemical energy. This chemical energy is stored in the molecular bonds of organic compounds, which can be broken down to generate ATP — the cellular energy currency that drives biological functions. However, to perform photosynthesis, organisms also need other essential components, particularly water and carbon dioxide. Let's take the example of land plants. They use water from the soil, carbon dioxide from the air, and energy from the sun to synthesize sugar molecules, which fuels their growth, development, and physiology. The photosynthesis reaction also releases oxygen gas as a byproduct, which is essential for the survival of other organisms.