What Does Cascading Windows Mean?

Cascading windows is a type of arrangement of applications that are open on a Windows desktop. In this arrangement, the windows of the currently running applications overlap each other and their title bars are made visible to let the user know their open status. The cascading window arrangement can be used to manage multiple windows which are open simultaneously.

Techopedia Explains Cascading Windows

When the cascading windows option is enabled, currently running windows are put in a single stack, which is fanned out in a way such that the title bars are made visible. This is helpful in making all the open windows visible and accessible. The cascading arrangement of windows usually appears on the top left corner of the desktop screen and displays the windows in a cascade format.