A web directory is an organized collection of websites categorized by topics or themes. Unlike search engines that index pages based on algorithms, web directories rely on human editors to review and classify sites. This makes it easier for users to find specific information or resources within a particular category. Web directories can be general, covering a wide range of topics, or specialized, focusing on niche areas like health, technology, or travel. They often provide brief descriptions of each listed site, helping users understand what to expect before visiting. Popular examples include DMOZ and Yahoo Directory.