Google quality score is a rating system that Google uses to determine when and where your ads appear in the sponsored results for a given query. Higher Quality Scores across your AdWords account generally mean that your ads receive more impressions for lower costs
Here’s in depth information about quality score http://support.google.com/adwords/bi...n&answer=10215
What is Google’s Quality Score and what role does it play in ranking?
Fresh content and quality back links, This is Google quality score for a website.
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