Metal-poor stars are stars that have a lower abundance of elements heavier than helium, such as carbon, oxygen, and iron, compared to the Sun. These stars are typically older and formed in the early universe when the abundance of heavy elements was lower. Studying metal-poor stars can provide valuable insights into the early stages of galactic evolution, the formation of the first stars, and the nucleosynthesis processes that created heavier elements. Researchers in this area often investigate the chemical composition, kinematics, and evolutionary history of metal-poor stars to better understand the origins and evolution of our galaxy.