(much of this post is re-produced from articles found online and from Google.com)

One technique, 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 them from their indices.

The term “search engine friendly” may be used to describe web site designs, menus, content management systems, URLs, and shopping carts that are easy to optimize.

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