The chapter discusses the accessibility of information on the web, highlighting the limitations of search engines in indexing the vast majority of web content. As the web becomes a primary medium for communication, ensuring that information is easily accessible is crucial. The authors estimate that the publicly indexable web contains about 800 million pages, with a significant portion being commercial content. They also note that search engines index only a fraction of the web, with no single engine covering more than 16% of the total. This indexing bias can lead to delays in the availability of scientific research and affect the visibility of new, high-quality information. The chapter further examines the performance of major search engines, finding that they collectively cover about 42% of the estimated total number of web pages. The authors suggest that metasearch engines can improve coverage by combining the results of multiple search engines. Additionally, they highlight the bias in indexing, where pages with more links are more likely to be indexed, and new search techniques based on popularity can further bias the accessibility of information.The chapter discusses the accessibility of information on the web, highlighting the limitations of search engines in indexing the vast majority of web content. As the web becomes a primary medium for communication, ensuring that information is easily accessible is crucial. The authors estimate that the publicly indexable web contains about 800 million pages, with a significant portion being commercial content. They also note that search engines index only a fraction of the web, with no single engine covering more than 16% of the total. This indexing bias can lead to delays in the availability of scientific research and affect the visibility of new, high-quality information. The chapter further examines the performance of major search engines, finding that they collectively cover about 42% of the estimated total number of web pages. The authors suggest that metasearch engines can improve coverage by combining the results of multiple search engines. Additionally, they highlight the bias in indexing, where pages with more links are more likely to be indexed, and new search techniques based on popularity can further bias the accessibility of information.