Plants convert sunlight into energy through a process called photosynthesis. In photosynthesis, plants use chlorophyll, a green pigment found in their leaves, to absorb sunlight and convert it into chemical energy. This energy is then used to convert carbon dioxide from the air and water from the soil into glucose, a type of sugar that serves as the primary source of energy for the plant. Oxygen is also produced as a byproduct of photosynthesis, which is released into the atmosphere. Overall, photosynthesis is the process by which plants convert sunlight into usable energy in the form of glucose, which fuels their growth and metabolic processes.