"Quality Score is an estimate of how relevant your ads, keywords and landing page are to a person seeing your ad." http://support.google.com/adwords/bin/answer.

"Quality Score is an estimate of how relevant your ads, keywords and landing page are to a person seeing your ad." http://support.google.com/adwords/bin/answer.py?hl=en-GB&answer=2454010 http://support.google.com/adwords/bin/answer.py?hl=en-GB&#38... It only matters if you promote a page via Google Adwords.