It can be use for anything you want to show, imagine a superchat where you can zapvertise your product... An image, a gif or even a QR code
This is jus a little demo where the zap goes through my npub and I set it with a minimum of 500 sats to show. If you zap my profile from ANY client will show on my stream screen with whatever comment you add to it, regardless of not even watching the stream. This can be avoided by using naddr or nevent instead.
