During photosynthesis, plants produce oxygen (O2) as a byproduct. This process occurs primarily in the chloroplasts of plant cells, where light energy is captured and converted into chemical energy. During photosynthesis, carbon dioxide (CO2) and water (H2O) are utilized to produce glucose (C6H12O6) and oxygen. The oxygen generated is released into the atmosphere, which is vital for supporting aerobic life on Earth. This process not only sustains plants but also plays a crucial role in regulating atmospheric CO2 levels and supporting the global ecosystem by providing oxygen for animals and humans.