Showing different content to search engines than you show to human visitors.
Glossary Term: Black Hat SEO Terms
A spammy tactic involving the overuse of important keywords and their variants in your content and links.
Refers to a Google “Manual Action” where a human reviewer has determined certain pages on your site violate Google’s quality guidelines.
Exchanging money, or something else of value, for a link. If a link is purchased, it constitutes an advertisement and should be treated with a nofollow tag so that it does not pass PageRank.
Taking content from websites that you do not own and republishing it without permission on your own site.