Black hat seo technique does not follow sear engine guide lines. If you follow this technique initially your website is good position in SERP but in long run your website is not visible to SERP, that means your website is permanently deleted in SERP.
Black hat SEO refers to a set of practices that are used to increases a site or page's rank in search engines through means that violate the search engines' terms of service.Tactics and techniques that qualify as Black Hat SEO.
Black Hat SEO is most commonly defined as a disapproved practice that nevertheless could increase a page's ranking in a search engine result page (SERP). These practices are against the search engine's terms of service and can result in the site being banned from the search engine and affiliate sites. A list of tactics and strategies employed by black hat SEO practitioners have been openly denounced on Google webmaster to check the disadvantages.