Black hat SEO is the practice of focusing on SEO at the expense of the user.
Earlier we mentioned that Google created a list of Webmaster Guidelines that highlight Google’s expectations about creating webpages that have the best interests of the user in mind. The guidelines discourage creating sites that try to simply outsmart the algorithm.
Black hat strategies include a blog that is stuffed with keywords and links, but provides no value for the reader. Search engines can easily detect black hat SEO strategies and the site will be penalized.