The MAC address is often printed on a label attached to the device, or printed on the box it came in. In order to find the MAC address of the Ethernet device, you must first execute all the below commands as a root. On Linux systems, the Ethernet device is typically called eth0. In Microsoft Windows, getting MAC Address is very easy task but in Linux, there are so many different ways through which you can get the MAC Address and especially if you are doing some BASH/Python work, its very important that you should get the MAC Address in just one line without any extra information about the interface.

MAC addresses are used as a network address for most IEEE 802 network technologies, including Ethernet and Wi-Fi.

A media access control address (MAC address) of a device is a unique identifier assigned to a network interface controller (NIC) for communications at the data link layer of a network segment.