Black hat refers to unethical and manipulative techniques used in internet marketing and search engine optimization (SEO) to achieve quick and artificial results. These tactics violate search engine guidelines and aim to deceive search engines and users by exploiting loopholes in algorithms. Black hat techniques include keyword stuffing, hidden text, cloaking, link schemes, and other practices that prioritize search engine rankings over user experience and long-term sustainability. Engaging in black hat SEO can lead to severe penalties, including website deindexing and loss of organic traffic.