ICS - iCalendar File is a calendar that happens to be universal. Many different email and calendar programs use this format. Some of the programs include Outlook, Google Calendar, and even iCal from Apple. You will be able to gather different types of information right on the internet and through your email. When certain requests are sent out to users, they will be able to transfer those events right onto their calendar. This is one of the reasons why this format happens to be so popular. Everything is stored through a plain text format as well. The summary, and even the start time are a few pieces of information that can be accessed.