Some details in this article reflect the Dashboard version that is currently in Beta. The official release to App will occur on August 6th.
A Singular Output URL is a webpage that displays only the overlays currently on-stream/on-air from your Control Application.
This URL can be accessed in your Control Application by selecting the copy url button. The URL can be added to external environments (e.g. over video, in encoders, as a iframe on a webpage etc.). Learn more about outputting, here.