Calendar apps are digital tools that help you organize your schedule and manage your time effectively. They allow you to create events, set reminders, and view your plans in different formats, such as daily, weekly, or monthly. Popular examples of calendar apps include Google Calendar and Apple Calendar, which sync across devices, making it easy to access your schedule anywhere. These apps often come with additional features, like sharing calendars with friends or colleagues, integrating with other apps, and sending notifications for upcoming events. By using a calendar app, you can stay on top of important dates, appointments, and tasks, ensuring you never miss a deadline.