If you keep the (good habit) of tagging Players, you can benefit from it during Campaign publishing. You can prevent Campaigns from being played on tagged players, or only publish to them.
For instance, let’s say you are a digital signage provider and distribute advertisements within your network, which include different restaurant chains. It certainly would be a problem if you published a restaurant or fast food chain advertisement to the wrong establishment.
Learn how to use tags to avoid this mishap: