Appointments are activities that you schedule in your calendar that do not involve inviting other people or reserving resources. You can schedule recurring appointments, view your appointments by day, week, or month, and set reminders for your appointments.
You can specify how the appointments in your calendar look to others by designating the time of the appointment as busy, free, tentative, or out of office. Also, others can give you permission to schedule or make changes to appointments in their calendars.
A meeting is an appointment to which you invite people or reserve resources for. You can create and send meeting requests and reserve resources for face-to-face meetings or for online meetings. When you create a meeting, you identify the people to invite and the resources to reserve, and you pick a meeting time. Responses to your meeting request appear in your Inbox. You can also add people to an existing meeting or reschedule a meeting.