You may be curious about a number of keys on the keyboard you generally don’t use. The three buttons labeled Ctrl, Alt, and Delete, when pressed together at the same time, opens the Task Manager.
But why startup the task manager? That’s simple; the main use is to shut down any programs or processes that cause issues. Some programs lock up, or they don’t well with other programs. You can open Task Manager to select the troublemaker and force them to shut down.
Task Manager also shows you other information, which you can explore, but I generally use this application to shut down windows that are giving me grief.
Restarting your system will return your system to normal, but it might also startup the offending program, so use your better judgment.