Low-metallicity refers to the study of astronomical objects, such as stars, galaxies, and interstellar gas clouds, that have a lower abundance of heavy elements (i.e., elements heavier than hydrogen and helium) compared to the Sun. These low-metallicity environments are thought to represent some of the earliest and most pristine regions in the universe, providing important insights into the formation and evolution of galaxies, the production of heavy elements through stellar nucleosynthesis, and the physical processes driving star formation. Researchers in this field often use observations from telescopes and modeling techniques to investigate the properties and behavior of low-metallicity objects and understand their impact on the broader cosmic landscape.