Notes display short messages to the user. Usually a note is displayed on the screen for a few seconds, but the user can also dismiss it sooner. In graphical user interfaces, a Notes is a special window, used in user interfaces to display information to the user.
Depending on your requirement, design an application in such a way that note can show meaningful message
Confirmation note is used to show successfully completed operation. The symbol at right side of dialog confirm the user that operation completed successfully. Use confirmation note when the effect of the operation cannot be seen directly by user.
Information note is used to show an unexpected situation occur in application. An information note should be used when an error that can be rectified occurs. Information note can note be used to show error message.
Warning notes can be used to notify user about some action. It should also play a warning tone. for example battery is low.