A Web Directory is an organized collection of websites categorized by topics or themes. Unlike search engines, which index pages based on algorithms, web directories rely on human curation to list sites. Users can browse through various categories to find relevant websites, making it easier to discover information on specific subjects. Web directories often include descriptions of each listed site, helping users understand what to expect. Popular examples of web directories include DMOZ and Yahoo Directory. While their usage has declined with the rise of search engines, they still serve as valuable resources for niche topics and curated content.