The function of chlorophyll in photosynthesis is to absorb light energy, primarily from the sun. This green pigment is located in the chloroplasts of plant cells and captures light energy, which is converted into chemical energy during the photosynthesis process. Chlorophyll primarily absorbs light in the blue and red wavelengths, while reflecting green light, which is why plants appear green. This absorbed energy is used to convert carbon dioxide and water into glucose and oxygen, providing the fundamental energy source for almost all life on Earth.