Google Analytics

As Google defines it:  What is the Google AnalyticsGoogle Analytics is a freemium web analytics service offered by Google that tracks and reports website traffic. Google launched the service in November 2005 after acquiring Urchin. Google Analytics is now the most widely used web analytics service on the Internet. https://www.google.com/analytics/

Demo Google Analytics site: Access the demo account

Check out this youtube Video series to get started: