Key Points of Black Hat SEO

Black hat SEO attempts to improve rankings in ways that are disapproved of by the search engines, or involve deception. One black hat technique uses text that is hidden, either as text colored similar to the background, in an invisible div, or positioned off screen. Another method gives a different page depending on whether the page is being requested by a human visitor or a search engine, a technique known as cloaking Invisible iframes is yet another black hat SEO technique, where a page you see is not necessarily from the company that is hosting that webpage. People create these types of pages in order to download software on your computer in the background without your knowledge .

Search engines may penalize sites they discover using black hat methods, either by reducing their rankings or eliminating their listings from their databases altogether. Such penalties can be applied either automatically by the search engines’ algorithms, or by a manual site review. Infamous examples are the February 2006 Google removal of both BMW Germany and Ricoh Germany for use of deceptive practices.[42] and the April 2006 removal of the PPC Agency BigMouthMedia.[43] All three companies, however, quickly apologized, fixed the offending pages, and were restored to Google’s list.[44]
Many Web applications employ back-end systems that dynamically modify page content (both visible and meta-data, for example the page title or meta-keywords) and are designed to increase page relevance to search engines based upon how past visitors reached the original page. This dynamic search engine optimization and tuning process can be (and has been) abused by criminals in the past. Exploitation of Web applications that dynamically alter themselves can be poisoned. The above material (text and image) was taken from Wikipedia: http://en.wikipedia.org/wiki/Search_engine_optimization

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