Grey hat SEO is a technique that sits between white hat and black hat SEO. It uses tactics that are not clearly defined by search engine guidelines as either acceptable or unacceptable. Grey hat SEO is a blend of both, often employed to achieve quicker results than white hat SEO but without the risks associated with black hat techniques.
See also: White hat SEO, Black hat SEO
Further reading: White Hat vs. Black Hat SEO – Everything You Need to Know
