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Photosynthesis is a biochemical process during which the energy of light is converted into chemical energy in plants, algae and cyanobacteria. The overall chemical reaction of photosynthesis is

6H2O + 6CO2 + light ==> C6H12O6(glucose) + 6O2

In green plants and algae, the substance that initially receives the light energy is chlorophyll (a and b) and carotene, in bacteria rhodopsin. The typical color of photosyntetic active organisms (e.g., green or red) results mainly from the light that is not absorbed by the photosynthesis molecules.