The Composite Bus Enumerator is a type of Windows driver that allows the operating system to manage devices connected via the composite bus. The term "composite bus" typically refers to a bus architecture used to connect various devices, often in multimedia or video capture scenarios. It is used in systems where multiple types of devices or interfaces are routed through a single bus or connection, often in USB or other similar technologies.

The Composite Bus Enumerator itself is not a specific device, but rather a driver that Windows uses to interact with devices that may involve composite devices. For example, it may be used for USB video capture devices, multi-function peripheral devices, or even hybrid multimedia capture cards.