Calendar applications are digital tools that help users organize and manage their schedules. They allow individuals to create, edit, and share events, set reminders, and view their plans in various formats, such as daily, weekly, or monthly. Popular examples include Google Calendar and Apple Calendar, which sync across devices for easy access. These applications often integrate with other software, enabling users to link tasks, emails, and notes. Many calendar apps also support collaboration, allowing teams to coordinate meetings and deadlines efficiently. Features like color-coding and notifications enhance usability, making it easier to stay on top of important dates and commitments.