The NCM Composite Device is a driver related to the Network Control Model (NCM), which is used for devices like USB modems or mobile hotspots that provide internet connectivity over a USB connection. NCM is a protocol that allows network-related devices to communicate over USB, particularly in scenarios where the device functions as a network adapter. This type of driver is typically associated with mobile broadband devices, such as USB dongles, tethering solutions, or even some advanced smartphones and mobile hotspots that offer internet connectivity through a USB interface.

The NCM Composite Device driver helps Windows identify and interact with such devices correctly, enabling the computer to use the mobile broadband device as a network adapter, allowing the computer to access the internet through that connection.