Google Quality Guidelines: Search engine spam

Hidden text Using invisible text specifically tailored to search engine spiders
Cloaking Presenting different content for the same URL to the web user and the search engine spider
Sneaky redirects Using JavaScript to redirect web users to a page they did not expect, usually one that is unrelated to their
search query
Irrelevant keywords Employing techniques such as keyword stuffing
Duplicate content Using the same content on numerous domains or subdomains
Badware Using malicious tactics including phishing (pretending to be another site) and malware software
(installable on the victim’s PC)
Doorway pages Pages designed specifically for search engines to rank for certain search terms. Typically, doorway pages
include a redirect to the target page of interest
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