The USB Speech Port Windows Driver is a software component used for connecting and configuring speech recognition devices or voice input devices (such as a microphone or USB-based speech recognition hardware) to a computer running the Windows operating system. This driver allows the device to communicate with the computer and enables voice-related applications to process speech input effectively.

A common example of this would be devices like speech recognition microphones, digital dictation systems, or other voice-activated hardware that uses a USB connection to interface with the computer. The driver ensures the device works correctly with Windows and allows software like Dragon NaturallySpeaking, Windows Speech Recognition, or other voice-to-text programs to utilize the device.