Hello,
What is grey hat SEO?

Gray Hat SEO is an SEO practice that's riskier than White Hat SEO, but one that may or may not result in your site being banned from search engines and their affiliate sites.

Grey hat SEO techniques are a combination of Black Hat SEO techniques and white hat SEO techniques. It is basically making use of white hat techniques up to a level where it is just about to become a black hat SEO technique.

Grey Hat SEO is the practice of using technically legal methods to improve your site rankings, but which are ethically dubious, and could one day become black hat. Think of it like legal highs.

Grey hat SEO is an SEO practice that combines white hat and black hat SEO. Grey hat SEO is riskier than white hat SEO because it exploits the search engine guidelines to increase a page's rankings on the SERPs. Grey hat SEO techniques are black masquerading as white.