Population III stars are hypothesized to be the first generation of stars that formed in the universe, composed almost entirely of hydrogen and helium with trace amounts of lithium and other light elements. These stars are thought to have formed from the primordial gas clouds that existed before any heavy elements were created through fusion in the cores of earlier stars. Population III stars are believed to be extremely massive and luminous, with some estimates suggesting they could have been hundreds or even thousands of times more massive than the Sun. They are also thought to have had very short lifespans, quickly burning through their fuel and ending in dramatic supernova explosions. Studying population III stars is difficult as they are thought to have formed over 13 billion years ago and are likely to have all died out by now. However, researchers are actively searching for signs of these ancient stars in the cosmic microwave background radiation, in the chemical composition of ancient galaxies, and in the remnants of early supernova explosions. Understanding population III stars is essential for gaining insights into the early universe and the formation of the first galaxies.