A subunit is a smaller, distinct part of a larger unit or structure. In biology, for example, subunits can refer to the individual components of a protein, which are often made up of amino acids. These subunits come together to form a functional protein, playing crucial roles in various biological processes. In other contexts, such as economics or organizational structures, a subunit can refer to a division or department within a larger entity, like a company or government. Each subunit typically has specific responsibilities and functions that contribute to the overall goals of the larger organization, such as business operations or public administration.