Mysterious icons/links on home screen

I don't know how to best desribe this issue. I leave computer on all night. In the morning, when I move the mouse to activate the screen, there is a large, 3-panel image with links to various websites. Today's panels are titled "Daily Wonder," "Hats Off to the Class of '25," and "Markets." A click on any of these panels takes me to a website. No idea how these panels are produced or by whom. If I try to take a screenshot, the images disappear and normal home screen is shown. I do not recognize anything in the Task Manager that might explain this. Perhaps another user can ask me questions that will lead to more information.