Does anyone know where this ad come from? i open any app and it appears randomly, how to remove it?

Lately, I’ve been getting random pop-up ads on my Android device, even when I'm not actively using a browser. These ads appear over any app I’m using — YouTube, messaging, games, etc. It’s not limited to a specific app; they just appear at random times. Example: I haven't recently installed any sketchy apps, but I suspect one of the apps might be causing this in the background. It's super disruptive and annoying. Has anyone experienced this before? How can I find the source of the ad and stop it permanently?