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All full-search system is arranged so that if a person enters any search phrase, then receives a response to it from the set of links, these links can sometimes be too much and it's not too convenient. Many people do not like to get to your questions are too many answers. Administrators search engines have decided that they could give people only the most popular and appreciated by reference only if you put them in your own theme directory. Thus was born the idea of long-developed literature search market. Search engines have begun to actively develop their own thematic catalogs, and editors began to select their most popular and interesting resources. Now thematic links were not the primary means of finding relevant sites, as it was before,

as a subsidiary. Using the rubric of substantive directory, search engine puts in the top lines of search results, especially those sites that are in the directory. What websites in the directory can also have its own weight. This weight may be assigned by the editors of the site directory, can earn a number of transitions for a resource with a search engine or the number of pages linking to it. Also, a search index puts in the upper line of the addresses of pages that match the most visited section of the topical directory. This type of ranking is called the ranking of the directory or catalog of ranking. This approach is advantageous because you can use the directories created by other companies are buying only the right of access to it, as does the search engine Google. Own a thematic catalog from Google is not, but the search engine uses the data, which gives her a catalog ODP. Actually, a lot of American search engines use this link directory. The idea of cataloging ranking arose because often people are looking for a similar search query is the same, but in practice it turned out that the human needs the Internet as shown in Kryvyi mirror. Sites on the same topics presented widely and visited an active and on the other, no less important - no. Therefore, many users do not continually fall prey to where it is necessary. When asked, «Love» pornosayty went on, but if you ask «machine» they do not offer to meet with automotive sites, and with the ideology of «search engine».

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