What is iCal or ICS?

iCal is a computer file format which allows Internet users to send meeting requests and tasks to other Internet users by sharing or sending files in this format through various methods. The files usually have an extension of .ics. With supporting software, such as an email reader or calendar application, recipients of an iCal data file can easily respond to the sender or counter propose another meeting at a different date/time. 

Example:

BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//hacksw/handcal//NONSGML v1.0//EN
BEGIN:VEVENT
UID:[e-mail]
DTSTAMP:19970714T170000Z
ORGANIZER;CN=John Doe:MAILTO:[e-mail]
DTSTART:19970714T170000Z
DTEND:19970715T035959Z
SUMMARY:Bastille Day Party
END:VEVENT
END:VCALENDAR

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