The web contains about 800 million pages, with 6 terabytes of text data. Search engines do not index all web pages, with only about 16% of the web being indexed. The web is becoming a major communication medium, and information must be made more accessible. Search engines are important in this process, but they do not index new pages quickly, and their coverage is limited. The publicly indexable web contains about 2.8 million servers, with 800 million pages. The mean size of a page is 18.7 kilobytes, leading to an estimate of 15 terabytes of data. Scientific information is valuable, but only a small percentage of servers contain it. Search engines vary in their coverage, with some engines having higher coverage than others. The coverage of search engines is influenced by factors such as indexing techniques and the number of pages indexed. Search engines may not index all pages due to technical limitations, network bandwidth, or economic reasons. The accessibility of information on the web is not equal, as search engines tend to index pages with more links. This creates a bias in the information available. New search techniques that use popularity metrics further bias the accessibility of information. The use of such techniques may delay the visibility of new, high-quality information. The web is transforming society, and search engines play a key role in this transformation. However, the current indexing capabilities of search engines are limited, and there is a need for improvement in the accessibility of information on the web.The web contains about 800 million pages, with 6 terabytes of text data. Search engines do not index all web pages, with only about 16% of the web being indexed. The web is becoming a major communication medium, and information must be made more accessible. Search engines are important in this process, but they do not index new pages quickly, and their coverage is limited. The publicly indexable web contains about 2.8 million servers, with 800 million pages. The mean size of a page is 18.7 kilobytes, leading to an estimate of 15 terabytes of data. Scientific information is valuable, but only a small percentage of servers contain it. Search engines vary in their coverage, with some engines having higher coverage than others. The coverage of search engines is influenced by factors such as indexing techniques and the number of pages indexed. Search engines may not index all pages due to technical limitations, network bandwidth, or economic reasons. The accessibility of information on the web is not equal, as search engines tend to index pages with more links. This creates a bias in the information available. New search techniques that use popularity metrics further bias the accessibility of information. The use of such techniques may delay the visibility of new, high-quality information. The web is transforming society, and search engines play a key role in this transformation. However, the current indexing capabilities of search engines are limited, and there is a need for improvement in the accessibility of information on the web.