notification

noun

1. (uncountable)The act of notifying.
2. (countable)A specific piece of information that serves to notify.
3. (countable)A message, alert, or signal displayed by a system or application to inform the user of an event, update, new message, etc.

   “A notification popped up on my computer.”

   “I received an e-mail notification on my phone.”

   “Watch for notifications on the top screen[.]”