Gray Hat SEO ??

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.It's a combination of both Black Hat and White Hat,but not too much Black Hat.

Hello friends,
It is basically combination of white hat SEO and black hat SEO techniques.

Here are some of the Grey Hat Methods:

Cloaking
There are times when cloaking is considered a legitimate tactic by users and search engines alike. Basically, if there is a logical reason why you should be allowed to present different information to the search engines than the visitor (if you have content behind a "members only" area for example) you are relatively safe. Even so, this tactic is very risky and it is recommended that you contact each search engine, present your reasoning, and allow them the opportunity to approve it's use.

Paid Links
The practice of purchasing link on websites solely for the increase in link-popularity that it can mean has grown steadily over the last year-or-so with link auction sites such as LinkAdage making this practice easier.
When links are purchased as pure advertising the practice is considered legitimate, while the practice of purchasing links only for the increase in link-popularity is considered an abuse and efforts will be made to either discount the links or penalize the site (usually the sellers though not always).As a general rule, if you are purchasing links you should do so for the traffic that they will yield and consider any increase in link-popularity to be an "added bonus".

Duplicate Content
Due primarily to the increase in popularity of affiliate programs, duplicate content on the web has become an increasingly significant problem for both search engines and search engine users alike with the same or similar sitesdominating the top positions in the search engine results pages.

hope this could help

Paid Links and Duplicate Content are not Gray Hat SEO. There is no company that doesn't buy links, it is legal and there isn't anything wrong about it. The search engines now day find most of the Duplicate Content, so you are not ranking with those sites.

Gray Hat SEO is just an expression for stuff that can't be clearly categorised as white or black, like the good example cloaking. But there isn't really an grat hat seo in my opinion. As there is alos no blue hat seo:-).

Grey hat is a thin line between white hat and black hat. This approach has less risk of being penalised by Google than black hat SEO techniques but is not as favourable as white hat SE

Gray hat technique is the combination of white hat and black hat techniques. A SEO use these techniques for fast ranking in search engines this is a risky work because google is very smart if he notice this maybe our site going on penalty. Then our site is not shown in search.

The Grey hate SEO is a combination of organic and black hate seo. Previously you should make doorway pages and clocking after u optimize the site.

Grey hat seo is where you optimize your site while exhausting a charcoal colored Fedora.