The WCDMA DataCard Ethernet Adapter is a type of network driver typically associated with 3G/4G USB modems or data cards that use WCDMA (Wideband Code Division Multiple Access) technology. These devices are often used to provide mobile broadband (internet) access through cellular networks. The Ethernet Adapter part of the name usually indicates that the device is emulating a network adapter over the USB interface, allowing the computer to treat the device as an Ethernet connection for data transfer.

In short, the WCDMA DataCard Ethernet Adapter driver is needed for the system to recognize the data card as a network device, allowing you to access the internet or transfer data over the mobile network.