The RDC PCI Fast Ethernet Adapter is a type of network interface card (NIC) that provides Ethernet connectivity to your computer via a PCI (Peripheral Component Interconnect) slot. The "Fast Ethernet" part refers to a network speed of 100 Mbps, which was common in the late 1990s and early 2000s, though it is less common today as Gigabit Ethernet (1000 Mbps) has become the standard. The RDC PCI Fast Ethernet Adapter typically uses an RDC (Realtek Data Communications) chipset or a similar OEM chipset, which is common in budget or older networking hardware.

The Windows driver for the RDC PCI Fast Ethernet Adapter allows your computer to communicate with the adapter and use it to connect to a local area network (LAN) for internet access or file sharing.