A 2-Port UART Windows driver refers to a driver that enables communication between a computer and a device through a 2-port Universal Asynchronous Receiver/Transmitter (UART) interface. UART is a hardware communication protocol commonly used for serial communication, which allows data to be transmitted and received between two devices (such as a computer and microcontroller, or between two computers).

A 2-port UART typically means there are two separate serial communication ports on a single device, which can be used for communicating with multiple serial devices simultaneously.