What is the function of the Event Viewer?

Keep logs of applications activities in your system.

Explanation:

Event viewer contains applications activities logs such as errors encountered by the application, prompts, and warnings in the system. This could be handy in terms of troubleshooting as system admins or users can take a look at the logs and examine the problems.

You can open or run event viewer in Windows by simply type "event viewer" in the start menu and click on the result or icon.