What exactly is “label” parameter in ClipData in Android?

ClipData clip = ClipData.newPlainText(
            "text label", 
            "content to be copied");

here text label describes what data is in clip

eg.

ClipData clip = ClipData.newPlainText(
            "user Name",
            user.getName()); 

we can retrive this by using

clip.getDescription ();