vCalendar defines a transport and platform-independent format for exchanging calendaring and scheduling information in an easy, automated, and consistent manner. It captures information about event and "to-do" items that are normally used by applications such as a personal information managers (PIMs) and group schedulers. Programs that use vCalendar can exchange important data about events so that you can schedule meetings with anyone who has a vCalendar-aware program.

iCalendar consists of three RFCs:

• RFC 2445, Internet Calendaring and Scheduling Core Object Specification (iCalendar)
• RFC 2446, iCalendar Transport-Independent Interoperability Protocol (iTIP): Scheduling Events, BusyTime, To-dos and Journal Entries
• RFC 2447, iCalendar Message-based Interoperability Protocol (iMIP)

• An overview of vCalendar
• vCalendar White Paper
• Specifications and other materials for product developers
• IETF Calendaring and Scheduling Working Group, where the next generation of vCalendar is being worked on