The Label widget is a standard Tkinter widget used to display a text or image on the screen. The button can only display text in a single font, but the text may span more than one line. In addition, one of the characters can be underlined, for example to mark a keyboard shortcut.
Labels are used to display texts and images. The label widget uses double buffering, so you can update the contents at any time, without annoying flicker.
To display data that the user can manipulate in place, it's probably easier to use the Canvas widget.