Definitions for "Alert box"
Keywords:  dialog, beep, joptionpane, jfc, warn
interface: A message box that appears when the Mac needs to tell you something important. It usually brings bad news and a beep.
A box that appears on the screen when there is an error or a warning message. It is usually accompanied by a sound.
A type of dialog box that pops up to notify you of a condition that may affect how you can enter information or the kind of information you can enter. It requires you to acknowledge the message before you can continue.
a secondary window that provides for brief interaction with users