An EHWIC (Enhanced High-Speed WAN Interface Card) is a type of network interface card used in Cisco routers. It provides additional ports for connecting to WAN networks, such as T1, E1, and ISDN. It also supports advanced features such as Quality of Service (QoS) and link aggregation. EHWICs are available in a variety of form factors, including single-port, dual-port, and quad-port. They are designed to be used in conjunction with Cisco routers, and are compatible with a wide range of Cisco IOS software versions. EHWICs are an ideal solution for businesses that need to expand their network capabilities without investing in additional hardware.