Facts That Google Considers Spam

Google doesn't like web spam at all. Some facts are highlighted below:

• The first fact for spam is a page that is stuffed with hundreds of keywords in a comma separated list. Google doesn’t want that type of pages in the search results.  

• The second fact for spam is a page that has normal text. However, the text contains keyword optimized links that are totally unrelated to the surrounding text. 

• Other things/facts that Google considers spam are linking schemes, misleading redirects or purposeful duplicate content.