A notification system is a tool that alerts users about important events or updates. These systems can be found in various applications, such as email, messaging apps, and social media platforms. They help users stay informed by sending messages, alerts, or reminders based on specific triggers, like new messages or upcoming deadlines. Notification systems can be categorized into two main types: push notifications and pull notifications. Push notifications are sent directly to users' devices, while pull notifications require users to check for updates manually. Both types aim to enhance user engagement and ensure timely communication, making them essential in today's digital landscape.