NIC stands for Network Interface Card
eth0is the first Ethernet interface. (Additional Ethernet interfaces would be namedeth1,eth2,etc.) This type of interface is usually a NIC connected to the network by a category 5 cable.lo: The loopback device This is a special network interface that the system uses to communicate with itself.wlan0is the name of the first wireless network interface on the system. Additional wireless interfaces would be namedwlan1,wlan2, etc.