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Unit_3_SEO_how_search_engines_work.v3

Unit_3_SEO_how_search_engines_work.v3 - How Search Engines...

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How Search Engines Work ISDS 3105 SEO Lesson 3
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Learning Objective Know how search engines work Know what crawlers and spiders are Know how information is indexed
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Web Information Retrieval Challenges Massive size of the Web About 10 billion pages in 2004 Dynamic nature of the Web About one fourth of .com pages change daily Self-organized No librarian control Hyperlinked link rot: degeneration of web page due to links that become invalid1 (50% of links get disconnected within 4 years) Spammers 3
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How Search Engines Work? A Bare Bones Look: 1. The searcher types a query into the search engine 2. The search engine software finds query matches 3. The search engine’s results are ranked in order of relevancy 3 Basic Tasks 1. To search the Internet based on important words 2. To keep an index of the words and locations 3. To allow users to look of words or combinations of words found in that index 1/16/12 4
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Spiders and Web Crawling Spider A computer program that prowls the Internet looking for publicly accessible resources that
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