A calendar alert is a notification that reminds users of upcoming events or tasks scheduled in their calendar application. These alerts can be set for specific times before the event, such as minutes, hours, or days in advance, helping individuals stay organized and on track. Most digital calendars allow users to customize their alerts, choosing different sounds or types of notifications, such as pop-ups or emails. This feature is useful for managing personal schedules, work commitments, and important dates, ensuring that nothing is overlooked.