How Google Defines Spam

As part of their Webmaster Guidelines, Google outlines techniques to use to help Google locate, index and rank your website. They also specifically state that the following techniques may lead them to remove your site from the Google index:
• Hidden text or hidden links.
• Cloaking or sneaky redirects.
• Automated queries to Google.
• Pages loaded with irrelevant keywords.
• Multiple pages, subdomains, or domains with substantially duplicate content.
• "Doorway" pages created just for search engines, or other "cookie cutter" approaches
such as affiliate programs with little or no original content.

However you should keep in mind that these aren't the only practices that Google disapproves of Generally, Google doesn't like their results manipulated by deceptive practices. Their recommendations for webmasters are:
Webmasters who spend their energies upholding the spirit of the basic principles listed above will provide a much better user experience and subsequently enjoy better ranking than those who spend their time looking for loopholes they can exploit.
To combat common search engine spam practices employed by rogue SEOs, Google has also posted a list of practices that should raise a red flag when you are looking for a search engine optimizer. According to Google, feel free to walk away from an SEO who:
• Owns shadow domains.
• Puts links to their other clients on doorway pages.
• Offers to sell keywords in the address bar.
• Doesn’t distinguish between actual search results and ads that appear in search results.
• Guarantees ranking, but only on obscure, long keyword phrases you would get anyway.
• Operates with multiple aliases or falsified WHOIS info.
• Gets traffic from "fake" search engines, spyware, or scumware.
• Has had domains removed from Google's index or is not itself listed in Google.

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