Negative SEO
Negative SEO involves using strategies and/or tactics to harm a web page's or website's search engine ranking(s) for various search terms (A web page can rank at the various search engines for multiple words/phrases). This is done through various methods and it causes search engines to penalize the targeted web pages or website.
While some negative SEO strategies and/or tactics can be subtle and very difficult or impossible to detect if done by someone with advanced search engine optimization (SEO) knowledge, negative SEO is generally not entirely undetectable. Modern SEO tools and techniques can help identify various forms of negative SEO, though some forms of sophisticated SEO attacks might require more advanced analysis.
Quotes
"Never harass a search engine optimization professional at a wiki. He has six ways from Sunday of lowering the search engine rankings of articles that you created." - Anonymous
"Subtle and stealthy, the expert search engine optimization professional leaves no trace of his negative SEO. He is mysterious and inaudible. Thus, he is master of his harrasser's article page view counts at a wiki." - Anonymous
