SEO

Search engine optimization (SEO) is the process of improving the volume and quality of traffic to a web site from search engines, based on an understanding of how search algorithms work and what people are searching for. 

 “SEO efforts may involve a site's coding, presentation, and structure, as well as fixing problems that could prevent search engine indexing programs from fully spidering a site. Other, more noticeable efforts may include adding unique content to a site, ensuring that content is easily indexed by search engine robots, and making the site more appealing to users. 

Another class of techniques, known as Black Hat SEO or spamdexing, use methods such as link farms and keyword stuffing that tend to harm search engine user experience. Search engines look for sites that employ these techniques and may remove their listings.”

From Wikipedia http://en.wikipedia.org/wiki/Search_engine_optimization

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