Keyword stuffing falls under the category of black hat SEO techniques, which are unethical practices used to manipulate search engine rankings. Other tactics in this category include cloaking, where different content is presented to search engines than to users, and doorway pages, which are low-quality pages stuffed with keywords that redirect users to another site. These techniques aim to deceive search engines but often lead to penalties.

In addition to keyword stuffing, other forms of content and link manipulation include meta tag stuffing, where keywords are overloaded in the meta tags of a webpage, and article spinning, which involves rewriting existing content to appear unique. Link farms, which are networks of websites that link to each other to increase link popularity, and content farms, which produce large amounts of low-quality content, are also related tactics. Search engines continuously update their algorithms to combat these manipulative practices.

When websites engage in keyword stuffing and related jargons like hidden text (where keywords are hidden within the page's code or background to avoid detection), they risk search engine penalties. These penalties can severely impact a website's visibility and traffic. Search engines strive to provide the best user experience by promoting high-quality, relevant content, and penalizing those who attempt to game the system through these underhanded tactics.