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# IOClass

The name of the class to instantiate from your driver.

## Discussion

The value of this key is a string that contains the name of a custom [`IOService`](https://developer.apple.com/documentation/kernel/ioservice-1g) subclass in your driver. When the system successfully matches one of your driver’s personalities to a device, it instantiates the class in this key and calls its <doc://com.apple.documentation/documentation/kernel/ioservice/1532606-start> method.

For the personalities in a DriverKit extension, specify the value `IOUserService` unless otherwise directed by the documentation. For example, the <doc://com.apple.documentation/documentation/HIDDriverKit/IOUserHIDEventService> class expects you to specify the value `AppleUserHIDEventService`.

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