Google Analytics is a free service provided by Google that offers a large set of statistics of your page / s web / s. Google Analytics along with AdWords and AdSense are the tools that will ease the way to success in the Google search engine.
Google Analytics is a very complete web analytics tool that can provide us with basic information such as: number of visitors and visits on our website, average visit duration, average page views by each user, geographical reports, sociodemographic , Location, Internet provider, mobile device, etc.). But it also gives us much more complex information such as: the performance of our AdWords campaign, the percentage of conversions our website receives, or the behavior of users in a buying process, and why users leave our site Web, in addition to many other variables.
Google Analytics expresses our website in such a way that with time, study and dedication we can be able to find out the failures and the successes that day by day occur in our website and to solve them.