The evolution of photosynthesis marks a pivotal moment in the history of life on Earth, ushering in the transformative ability of organisms to harness sunlight, convert carbon dioxide, and release oxygen—fundamental processes that shaped our planetary atmosphere.This remarkable adaptation not only led to the origin of photosynthesis among cyanobacteria but also set the stage for the Great Oxidation Event, approximately 2.3 billion years ago, when oxygen levels rose significantly.