What is Grey Hat SEO?
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Gray Hat SEO is about risk versus reward. Some Gray Hat SEO services tend to use more dubious devices and take bigger risks. Gray hat SEO is SEO techniques that take more risks than white hat SEO techniques but aren't likely to get your site banned from search engines (although a search engine penalty could result).
Gray hat is nothing just a combination of both White hat and black hat.But we not consider black hat as a SEO technique.This is unwanted techniques generally web masters are not follow.The only one hat in SEO that is known as White hat or Natural link building.After the Google Penguin update Relevancy and quality work will generate results for your website.So always follow the rules and believe in natural link building techniques.
The following tactics fall in the grey area between legitimate tactics and search engine spam. They include tactics such as cloaking, paid links, duplicate content and a number of others. Unless you are on the correct side of this equation these tactics are not recommended.