Windows 11 includes a built-in Task Scheduler that allows users to create custom notifications for various purposes, such as reminders or alerts. Users can access Task Scheduler by searching for it in the taskbar or Start menu, and they can create a basic task by navigating to the Action menu. Notifications can be scheduled with different frequencies, including daily, weekly, monthly, or based on specific events. Users can input notification text using the "msg" command in the Program/script field. Additionally, the Microsoft Clock app allows users to set custom alarms, while the Microsoft To Do app enables task creation with attached reminders. Third-party apps like TickTick also offer similar notification functionalities.