MAC Address is the media access control address, also known as the LAN Address, Ethernet Address, or Physical Address.It is an address used to confirm the location of a network device.In the OSI model, the third network layer is responsible for IP address, while the second data link layer is responsible for MAC address. MAC address is used to uniquely identify a network card in the network. If a device has one or more network cards, each network card needs and will have a unique MAC address.