iCalendar
iCalendar (often abbreviated as iCal) is a standard file format for exchanging calendar and scheduling information between different applications and systems. It defines a common format for events, appointments, and tasks, enabling interoperability across platforms like Google Calendar, Apple Calendar, and Microsoft Outlook. The format uses the .ics file extension and is based on the RFC 5545 specification.
Developers should learn iCalendar when building applications that involve scheduling, event management, or calendar integration, such as booking systems, meeting planners, or productivity tools. It is essential for ensuring data portability and compatibility across diverse calendar services, allowing users to import/export events seamlessly. Use cases include generating event invites, syncing calendars between web and mobile apps, or automating calendar updates from external data sources.