The EdgePort8 is a device produced by FreeWave Technologies (now part of Digi International), designed to provide USB-to-serial port adapters. Essentially, it allows you to connect serial devices (like legacy equipment, industrial controllers, sensors, etc.) to a computer via a USB port. The EdgePort8 model specifically provides 8 serial ports over a single USB connection.
The Windows driver for the EdgePort8 is the software that enables your computer to recognize the device and communicate with the connected serial ports via USB.