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Notification Center on your Mac
Use Notification Center to view details about your day (calendar, stocks, weather, and more) and catch up on notifications you might have missed (email, reminders, app notifications, and more).
Open Notification Center. Click the Notification Center icon 
at the top right of the screen. Tap Today to see what’s coming up or Notifications to review what’s come in.
Learn more. See the Apple Support article Use Notifications on your Mac.