Black hat SEO refers to a set of techniques for improving a site's or page's search engine ranking without violating the search engines' terms of service. In Western films, the phrase "black hat" was coined to distinguish "evil guys" from "good ones" who wore white hats (see white hat SEO). It's now more generally used to describe computer hackers, virus producers, and others who engage in unethical computer behaviour.
Why is Black Hat SEO important?
Black hat SEO goes beyond search engine norms and manipulates them in order to get higher rankings. It can result in you being completely removed from search results or receiving a lower ranking. White hat SEO is a more ethical approach to SEO that focuses on producing high-quality content and providing a positive user experience.