Not sure, but WAN refers to Wide Area Network. It’s probably a driver used by a VPN client, dial-up modem, etc., maybe even a VM (virtual machine), something that needs to establish a remote/unbridged connection to another network. I can't be more exact since I don't who/what installed it. I assume it’s listed under Device Manager. Is it causing a problem? You might not be able to uninstall if it’s required by something else.