Blackhat is the Unethical way of doing SEO. This method is really risky because once you're caught by the search engines your site could get banned.
wtf ? what is illegal in black hat techniques ? fish google and their guidelines here is my definition for BH: The easiest way to make 300$/day online
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Definitions: Black Hat - A person engaged in or tactic used to increase search engine rankings using methods frowned upon by search engine companies. White Hat - legitimate optimization techniques employed that are agreeable to search engine companies, such as the proper use of meta-tags, an adequate keyword saturation and spider friendly page design. Gray Hat - Optimization strategies that are in a unknown area of reputability/validity.