A notification system is a tool that alerts users about important events or updates. It can be found in various applications, such as email clients, social media platforms, and mobile apps. Notifications can be delivered through different channels, including pop-up messages, emails, or text messages, ensuring users stay informed about relevant information. These systems help users manage their time and tasks more effectively by providing timely reminders and updates. For instance, a calendar app may send notifications for upcoming events, while a messaging app alerts users to new messages. Overall, notification systems enhance user engagement and streamline communication.