http://lmgtfy.com/?q=White+Hat+SEO+vs+Black+Hat+SEOWhite Hat SEO - Strictly following the Google Webmaster Guidelines (focusing more on what's best for the user).
Black Hat SEO - Discovering and manipulating flaws in Google's algorithm to gain an advantage in the SERPs (focusing more on what's best for the search engines).
Grey Hat SEO - Using a combination of both white hat SEO and black hat SEO.
By the way, you could have just searched Google to find this answer.
Black-hat SEO is executed through posting articles - either paid ones or guest posts. and Black-hat SEO is buying links - usually on a big number of sites
There is no such thing as white hat SEO! All SEO is considered to be black hat and what people call white hat SEO is really just a mixture of online marketing and public relations.
So the white hat is useless by looking black hat SEO in your opinion?
I'm just going to start creating and posting these when I notice older members posting these questions.Seriously? You been registered 2 years and still don't know? LOL