The Hauppauge WinTV 8789 WDM Aux Driver is a driver used for Hauppauge TV tuner cards and video capture devices that utilize the BT878 chipset, which is commonly used in Hauppauge products. The "WDM" in the name refers to Windows Driver Model, which is a type of driver architecture designed to provide compatibility with various video and audio devices, including TV tuners and capture cards.

The WinTV 8789 WDM Aux Driver typically provides support for audio and video input functions, such as capturing TV signals, streaming video, and capturing audio from external sources. The Aux Driver component is an auxiliary driver that helps manage additional features or functionalities (like audio, TV channel scanning, or device-specific settings) that the main driver might rely on.