The Notification Center is a feature found in many operating systems, including iOS and macOS. It serves as a centralized hub where users can view and manage notifications from various apps and services. Notifications can include alerts for messages, reminders, calendar events, and updates from social media. Users can access the Notification Center by swiping down from the top of the screen on mobile devices or clicking an icon on the desktop. This feature allows for easy organization and prioritization of notifications, helping users stay informed without being overwhelmed by constant alerts.