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Published byViolet Eileen Taylor Modified over 9 years ago
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Internet Basics How Search Engines Work?
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Internet Search Engines Special sites on the web to find information stored on other sites Key words Index of the words Spiders: special software robots used to build lists of the words found on Web sites. Web crawling: Process of building the list of websites
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Web Crawling
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Google Academic search engine Sergey Brin and Lawrence Page Initial system: Use 3 or 4 spiders at a time 300 connections 100 pages/sec ~600 kb/sec data Each spider looks for 2 things The words within the page Words in titles, subtitles, meta tags Web in Plain English Web in Plain English
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Search engine capabilities Rated by the size of index Large engines (Google) - use for obscure (vague) information Yahoo – directory structure
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Web Searches in Plain English
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Common Search Commands Quotation Marks (“) For example: "Martin Luther King" Addition Sign(+) For example: + Florida + taxes Subtraction Sign(-) For example: + Washington -DC Asterisks(*) For example: Mexic* will look for Mexico, Mexican, Mexicali, etc. Boolean Logic
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