There are two major types of search engine optimization, white hat search engine optimization (the 'good' kind of SEO), and black hat (the 'not so good' kind). There are of course differing opinions about the nature of each type of SEO. Get the information you need to be able to tell them apart and make an informed decision when evaluating SEO campaign proposals.
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SEO techniques can be classified into two broad categories: techniques that search engine companies recommend as part of good design ("white hat"), and those techniques of which search engines do not approve ("black hat"). The search engines attempt to minimize the effect of the latter, among them spamdexing. Industry commentators have classified these methods, and the practitioners who employ them, as either white hat SEO, or black hat SEO. White hats tend to produce results that last a long time, whereas black hats anticipate that their sites may eventually be banned either temporarily or permanently once the search engines discover what they are doing.