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Web search is the hot topic of research today, since it is the one of the main ways of accessing content from the Web. Nowadays a search engine employs a special software robot to search for information on the millions of pages on the web. The software is also called as spiders or bots. Spiders build lists of the words found on Web sites. The spider is a program which follows links from one page to another and from one site to another. The spider will start from a popular site, adding the words found on this site to the search engine index and then it follows all links found within this site.
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