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18.1-18.2

18.1-18.2. Lam yee ching 5b. Search engine. Coordinated set of program Help user search web sites or web pages By matching keywords

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18.1-18.2

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  1. 18.1-18.2 Lam yeeching 5b

  2. Search engine • Coordinated set of program • Help user search web sites or web pages • By matching keywords • SEO may target different kinds of search, including image search, local search, video search, academic search, news search and industry-specific vertical search engines.

  3. Component • Spider(or called bot) • available to search throughout the internet • extract information from web pages • updates it search engine index accordingly • Own spider algorithm • Program that catalogues and stores the information searched by the spider into a huge database • Access program • Accepts search requests from users, compares them with the entries in database and returns the search results

  4. Types of search engine • General searches • e.g.yahoo.google • Specialized searches • e.g.business.com • General searches using natural languages • e.g.askjeeves!

  5. Quality information completeness accuracy authority objectivity timeliness legality

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