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Anything that has a day or time context to it should be placed on your calendar.
A chart or series of pages showing the days, weeks, and months of a particular year, or giving particular seasonal information.
An action that needs to happen on a specific day, but not necessarily at a specific time. For exampe, "call Dad for his birthday".
Something you need to know on a given day, such as the directions to the seminar you're attending.
Something you create (and trust) to alert you when you are required to do (or remember) something.
Any input that has arrived in your world for which you have not defined the meaning.
An action that must happen at a given time on a given date. Typical examples include meetings and appointments.
A mechanism to remind yourself of something at a given time in the future. When the time arrives, the contents of the tickler file are moved into an inbox for processing with all other stuff.
Anything you have decided to ignore or get rid of.