Google Analytics is a tool created by Google. With the help of this tool, you can find out which visitor came from where and for how long they have stayed on your website. You can also find out how many users are currently viewing your website near you in real time.
With the help of Google Analytics, you can find out how many users came to your different pages, how long they stayed, as well as track the conversion rate.
With the help of Google Analytics, you also get to know that the people who came to your website came from where they came by searching a keyword from the search engine or came from social media or any referral website like Quora, Medium, Digg, etc. Or come to your website from any such website.