Subcategories are smaller divisions within a broader category that help organize information or items into more specific groups. For example, in the category of fruits, subcategories might include citrus fruits, berries, and stone fruits. This classification makes it easier to find and understand related items. In various fields, subcategories can enhance clarity and efficiency. In library science, books are often categorized by genre, with subcategories like mystery, science fiction, and romance. This system allows readers to quickly locate books that match their interests, improving their overall experience.