Metals is a term employed in astrophysics and nuclear physics to denote all chemical elements with atomic numbers greater than two, thus encompassing all elements heavier than hydrogen and helium. This concept is central to research investigating cosmic chemical evolution, focusing on the nucleosynthesis pathways within stars and supernovae, the resulting abundances and spatial distribution of these elements across the universe, and their critical role in influencing stellar structure, evolution, and the formation of planetary systems.