Galaxy metallicity is a research area that focuses on the abundance of chemical elements in galaxies. The metallicity of a galaxy is primarily determined by the amount of heavier elements, such as iron, oxygen, and carbon, present in its stars and interstellar gas. Studying galaxy metallicity can provide valuable insights into the history of star formation, the evolution of galaxies, and the processes that govern the enrichment of elements in the universe. Researchers use a variety of observational techniques, such as spectroscopy, to measure the metallicity of galaxies and understand how it varies across different types of galaxies and at different cosmic epochs.