Google Analytics is a externally cloud hosted application that connects to your website or application via the use of a tracking code.
Google Analytics allows you to track the visitors to your website to see what browser they are using, to view what pages your users are visiting and for how long plus view where they are coming from. Google Analytics allows for the tracking of your website visitors and their activities on your website.
This information allows you to see what pages your users visit the most, the flow of their progress thought your website and if they are converting ( committing to an event like a shop purchase ). The information becomes very valuable as it provides insights into how your website is being utilised on a daily basis. You can then take informative action if you desire to enhance your users experience and to encourage users to stay longer on your website. The easier and more relevant you make your website for your audience, the better the overall experience for users and for search engines how direct traffic to your website.
Visit Google Analytics
https://analytics.google.com
Google Analytics Alternative Examples
Matomo
https://matomo.org
Chartbeat
https://chartbeat.com
SE Ranking
https://seranking.com
Woopra
https://www.woopra.com