Photosynthesis is a process in which

Photosynthesis is a process in which CO₂ is reduced.
Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy, through cellular respiration.
Photosynthesis occurs in two stages. In the first stage, light-dependent reactions or light reactions capture the energy of light and use it to make the hydrogen carrier NADPH and the energy-storage molecule ATP.
During the second stage, the light-independent reactions use these products to capture and reduce carbon dioxide.