Official Gmail Blog: Labels: drag and drop, hiding, and more

TODAY when just log into your gmail account you might have come across a message one that you can see in the picture show, well that a new feature that has been add to gmail , which is very easy to use just drag drop, hide and more, when you move your cursor near to select box of email received you can see a drag that appear to move the email to label it AND take it new location
you can also hide this label more clearly can be understood from the pic show