Google Analytics is a service offered by Google that generates detailed statistics about a website's traffic and traffic sources and
measures conversions and sales. It's the most widely used website statistics service.
Google Analytics can track visitors from all referrers, including search engines and social networks, direct visits and referring sites.
It also tracks display advertising, pay-per-click networks, email marketing and digital collateral such as links within PDF
documents
A Google Analytics query should be appended to the end of each ads’ landing page UR