Labels are simply bits of text that will show up wherever you place them in your app layout. These are convenient for displaying text descriptions or instructions for your field users.
Labels will show up on the mobile app as a read-only block of text to function as a guideline to the mobile user.
Labels have no fields of their own, they cannot be clicked or changed (outside of the editor).
Labels will show up on the default PDF reports, but they are not included in the exports.