When you are creating an Aero, you can choose one of three categories: Task, Appointment, or Other.
No matter which of the three you choose, the process of creating the Aero is exactly the same. However, to the end-user (the person assigned to the Aero), the three different Aero categories look different.
The task category is pretty self-explanatory. It's an Aero that is a task, like preparing a tax return or reconciling an account. You can add a checklist to a task and create a Recurring Aero that is a task.
Again the appointment category is pretty self-explanatory. Appointments are for Aeros that are time-dependent, like a meeting or webinar. You can add a checklist to a meeting and create a Recurring Aero that is an appointment.
The other category is used for Aeros which are neither tasks nor appointments, most often used to create notes. You can add a checklist to an Other Aero and create a recurring Aero that is Other.