What is blackhat SEO?

Black hat SEO(Search Engine Optimization) is an illegal way of doing SEO. All search engines have certain rules and regulations to determine a site’s ranking. Black hat SEO is the process of breaking these rules and trying to rank a site higher in an unfair way. It includes spamming and lots of other illegal ways to deceive the search engines. Certainly not a good practice for the SEO professionals and the site owner. It always should be avoided.