The USB4 Host Router Windows driver is a system driver that facilitates communication between your computer and devices connected via USB4. USB4 is a new USB standard (introduced in 2019) that supports high data transfer speeds, power delivery, and video output over a single USB connection. It is based on the Thunderbolt 3 protocol and offers several improvements over earlier USB standards.

A USB4 Host Router driver helps manage the USB4 interface by allowing the operating system (such as Windows) to recognize and handle USB4 devices correctly. This includes handling complex tasks like routing data and power, managing video signals, and ensuring compatibility with peripherals that use USB4 or Thunderbolt 3/4.