The TAP-Win32 Adapter V9 (Tunngle) is a virtual network adapter driver used by Tunngle, a now-defunct VPN (Virtual Private Network) software designed to create a virtual LAN (Local Area Network) for online gaming, allowing players to connect over the internet as if they were on the same local network. The TAP-Win32 Adapter V9 is a virtual network adapter that acts as a bridge between your computer and the Tunngle network, allowing data to flow between the virtual network and your real network connection.

The driver itself is installed as part of the Tunngle software package and functions as a virtual Ethernet adapter on your computer, enabling it to route traffic through the VPN network for games and other applications that require a local network connection.