Netlinking black hat refers to the unethical and manipulative practice of artificially increasing the number of backlinks to a website in order to improve its search engine ranking. This is done through tactics such as buying links, using link farms, and spamming forums and comment sections with irrelevant links. These tactics violate search engine guidelines and can result in penalties or even a complete ban from search engine results. Netlinking black hat is considered a shortcut to improve SEO, but it ultimately undermines the credibility and trustworthiness of a website.