# Categories

## Content

A category is a keyword or a phrase used to help you organize your appointments. There are 20 predefined categories available in Scheduler to assign to appointments. You can also use categories from a database or users can create their own custom categories at run time. Categories, which are stored in the <span data-popup-content="This class is available in both \u003ca href=\u0022/componentone/docs/wpf/online-scheduler/\u0022\u003e.NET\u003c/a\u003e and \u003ca href=\u0022/componentone/docs/wpf/online-scheduler/\u0022\u003e.NET Framework\u003c/a\u003e." data-popup-title="CategoryCollection" data-popup-theme="ui-tooltip-green qtip-green">CategoryCollection</span> class, are optional, and an appointment can have one or more categories assigned to it.

**Predefined Categories**

The predefined categories include the following:

| **Category** | **Index** |
| -------- | ----- |
| Business | 0 |
| Competition | 1 |
| Favorites | 2 |
| Gifts | 3 |
| Goals/Objectives | 4 |
| Holiday | 5 |
| Holiday Cards | 6 |
| Hot Contacts | 7 |
| Ideas | 8 |
| International | 9 |
| Key Customer | 10 |
| Miscellaneous | 11 |
| Personal | 12 |
| Phone Calls | 13 |
| Status | 14 |
| Strategies | 15 |
| Suppliers | 16 |
| Time&Expenses | 17 |
| VIP | 18 |
| Waiting | 19 |

## See Also

[Add Categories to the Categories List](/componentone/docs/wpf/online-scheduler/Appointments/Categories/Adding_Categories_to_the_Categories_List)

[Assign Categories to an Appointment](/componentone/docs/wpf/online-scheduler/Appointments/Categories/Assigning_Categories_to_an_Appointment)