Photosynthesis is a biological process used by plants, algae, and some bacteria to convert light energy, usually from the sun, into chemical energy stored in glucose molecules. This process involves the absorption of light by chlorophyll in chloroplasts, which triggers a series of chemical reactions that result in the conversion of carbon dioxide and water into glucose and oxygen. The equation for photosynthesis is: 6CO2 + 6H2O + light energy → C6H12O6 + 6O2.