A meeting occurs at a scheduled time, and it includes other people and a meeting location. A meeting in your calendar could be one you set up, or it could be one you’ve been invited to by someone else. Meetings appear both in your calendar and in the calendars of the other people who are involved.
In your calendar, you can tell the difference between a meeting and an appointment by the information in the meeting entry. In a meeting you'll see these:
The location of the meeting
The meeting organizer's name
A meeting in Outlook is set up with the help of a meeting request, which is delivered to the meeting participants via e-mail.