Folksonomy is a term used to describe a categorization system that is based on user-generated content. Synonyms for this term include social tagging, collaborative tagging, and user-driven categorization. Social tagging refers to the practice of users adding tags or keywords to items, such as photos, videos, or articles, to help categorize and organize them. Collaborative tagging, on the other hand, refers to the practice of multiple users contributing to the tagging of an item. User-driven categorization refers to the process of categorization being entirely in the hands of users, rather than a central authority or organization. These synonyms all refer to the same concept, but with different emphasis on the social aspect of the categorization system.