Google Analytics is a web analytics service that tracks and reports website traffic, providing insights and data for website owners to improve their online performance.

1. Visitors - The number of people landing on any page
   
2. Page views - The total number of pages viewed, including repeated views of the same page
   
3. Dwell time - The length of time people spend looking at pages
   
4. Total users - The total number of users
   
5. User engagement duration - The total amount of time people spend viewing pages or screens
   
6. New users - The number of users navigating to your site for the first time on a specific device
   
7. Events - The total number of Google Analytics events
   
8. User medium - The total number of Google Analytics events
   

Decimal metrics

1. Bounce rate - The percentage of visitors that navigate away from the site after only one page
   
2. Conversion rate - The number of conversions divided by the total number of ad interactions
   
3. Total revenue - The total revenue from web e-commerce or in-app transactions
   
4. Average user engagement time - The average amount of time users spend viewing pages or screens