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Definition of Search Engine Optimization (SEO) 1
"Natural," or "organic," search engine optimization (SEO) is designing, writing, and HTML-coding a Web site to maximize the chance its pages will appear at the top of spider-based search engine results for selected keywords and phrases
Organic Listings : Listings that search engines do not sell (unlike paid listings)
Link Farming: exchanging reciprocal links with Web sites in order to increase search engine optimization
Keyword Stuffing : Hidden text , Stuffing text in every nook and cranny
Cloaking : stealth , deliver one page to a search engine for indexing while serving a different page to everyone else.
Doorway Pages : A Web page that is designed to appeal to search engine spiders.
Fast meta refresh : used to quickly switch doorway pages to the page the user is supposed to see
Code swapping : swap it on the server with the "real" page once a position has been achieved. also sometimes done to keep others from learning exactly how the page ranked well.
Bait and Switch : Another technique combines word stuffing with "bait-and-switch," which loads the page with a popular search word such as sex, travel or antivirus, even though the word has nothing to do with the site content.