There are two major terms described in SEO: “white-hat” and “black-hat.” There is however a debate of the merits of white-hat and black-hat SEO, along with discussions about “grey-hat”, which is the sometimes ethically-fuzzy middle ground. Often these are questionable SEO tactics and once the web community may realise what you are doing, this could affect your online reputation.
Digital Organics give great example of these three types of SEO and what they could mean to your business. Make sure you read it through for more information about White Hat SEO vs Grey Hat and Black Hat SEO.
The game of SEO for 2012 has change, you should know which one the best for your website, blog or business.