Calendar applications are digital tools that help users organize and manage their schedules. They allow individuals to create, edit, and view events, appointments, and reminders. Many calendar apps can sync across multiple devices, ensuring that users have access to their schedules anytime and anywhere. These applications often include features like notifications, recurring events, and the ability to share calendars with others. Popular examples of calendar applications include Google Calendar, Apple Calendar, and Microsoft Outlook Calendar. They can be used for personal planning, work schedules, and even collaborative projects, making them versatile tools for time management.