The Intel(R) 82566DC-2 Gigabit Network Connection is a network interface card (NIC) that provides Gigabit Ethernet connectivity for your computer. This NIC is typically integrated into motherboards or can be part of a network adapter in desktops and laptops. The driver for this device allows the operating system (Windows, in this case) to communicate properly with the hardware, enabling you to access wired networks (Ethernet).