The Realtek RTL8111E is a Gigabit Ethernet controller commonly found in motherboards and network adapters. It supports 10/100/1000 Mbps speeds, PCI Express x1 interface, and IEEE 802.3 standards. Featuring low power consumption and auto-negotiation, it ensures stable network performance. The chipset includes Wake-on-LAN, VLAN tagging, and TCP/UDP checksum offloading. It is widely used in desktops and embedded systems, with driver support for Windows, Linux, and other operating systems.