Black Hat SEO
This is when text on a web page is invisible or hidden to a website user but visible and crawlable by search engines. The text is usually useless to a user but could be useful to search engine crawlers as it helps with understanding and ranking the web page.
Web pages contain links invisible or hidden to the user but can be seen and crawled by the search engines. Sometimes the links are hidden behind an image.
When website users are shown one web pages and the search engines are shown a different web page. For example, some websites show flash content to website users and HTML content to search engines. This is common on illegal streaming sites.
When a website owner pays money to get Backlinks from other websites. These Backlinks are not earned but rather paid for.
Keywords And Anchor Text Stuffing
Keyword stuffing is when there are too many keywords in the text making the text unreadable or unintelligent to a website user.
Anchor text stuffing is when keywords are used aggressively on Backlinks to the website.
An example of keyword stuffing:
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When a website uses “sensational” headlines to trick users into clicking and visiting their web pages. Usually the content on the web page is not related to the headline or not useful to the user.