What is an icalender or .ics file?
An icalender or ics file is a simple text file with some pre-defined format and tags saved with extension .ics. It is usually used for inviting someone to an event via email to which user can respond to actual sender very easily or can add an event in his/her calendar i.e. Google Calendar, Apple Calendar etc. The file format is specified in a proposed internet standard RFC 5545 . A Simple Example ICS file ICS file has a pre-defined format and Tags like if we talk about HTML page. BEGIN:VCALENDAR VERSION:2.0 PRODID:-//hacksw/handcal//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:REQUEST BEGIN:VEVENT DESCRIPTION:Meeting of board members DTSTART:20190206T090828Z DTEND:20190206T093828Z SUMMARY:Meeting LOCATION:6116 Breitenberg Radial Vanessaview\, AK 79372-4114\, West Vincenzo\, 86360-8926 URL:http://example.com DTSTAMP:20190206T090828Z UID:5c5aa40c3f305 ORGANIZER;CN=Joelle:MAILTO:ohackett@example.org END:VEVENT END:VCALENDAR ...