A "Category" is a way to group items, concepts, or people based on shared characteristics or qualities. This helps in organizing information, making it easier to understand and analyze. For example, in a library, books can be categorized by genres like fiction, non-fiction, or mystery. Categories can also be used in various fields, such as science, where living organisms are classified into categories like kingdom, phylum, and species. This classification system aids in studying relationships and differences among different life forms, enhancing our understanding of biodiversity.