Spamdexing (also known as web spam, search spam, or black hat SEO) is the practice of using deceptive tactics in an effort to manipulate search engine results.
With continuously evolving algorithms, search engines are increasingly able to detect spam and penalize websites that violate their quality guidelines.
Web spam can be categorized into two main types, content spam and link spam:
Content spam involves exaggerating the perceived relevance of a web page for specific keywords in search engines. Content spam include:
Link schemes are defined by Google as unnatural links to or from a site that are intended to manipulate PageRank or ranking in search results. Unnatural links include:
Google's algorithms remove the vast majority of spam from its search results automatically; however, sites that go undetected may be removed manually.