The Events reports show how people use interactive elements in your site or app.
For example, many websites contain video players, games, and other interactive experiences.
Simply tracking page views doesn’t allow you to capture these kind of interactions.
When a user interacts with a video player, no page view is generated.
Other examples of interactions that don’t generate page views are Ajax-based activities, file downloads, and clicks on links that take the user to another site.
To see event data, you’ll need to decide what kinds of interactions you want to track,
decide how you want to organize these events into Categories, Actions, and Labels, and
work with your web/app development team to implement events in your source code.
Read the Event Tracking Guide for more information.