3 types of SEO:
White Hat SEO:- White Hat SEO uses the techniques and guidelines of a search engine, wherein any content uploaded on the website should have relevant tags and headlines, through which a visitor should return to the website consistently. Along with this, it should increase the ranking of a website in search engines. White Hat type of SEO is a sort of like creating content for the website. Though it might be a slow process, but it gradually increases the ranking of the website.
Black Hat SEO:- Black Hat SEO refers to an aggressive way of utilizing different type of SEO strategies, in a way where focus is mainly on the website rather than on human audiences. It does not usually obey to the guidelines or rules of a search engine. Black Hat type is used by those who are looking for a quicker financial return on the website, rather than longer term financial returns on the website. The techniques used by Black Hat type of SEOs are like, LinkFarms, Hidden Texts, Keyword stuffing, Blog Spam, Scraping, Paid Links, Doorway Pages, Parasite Hosting or Cloaking. These processes may be quick, but will not be long lasting as White Hat.
Grey Hat SEO:- As the color suggests, this type of SEO technique comes somewhere between the Black and White type. So while considering different type of SEO as well, this type comes between White and Black Hat types of SEO. It uses techniques like three way link exchange, article spinning, buying of old domains, buying expired domains and at last Google Bombing also.