A media access control address is a binary combination of 12 digits used to identify the network hardware on a computer. The MAC address is used by an Internet provider to identify a computer on its network, which allows the computer to connect to the Internet.
The first six binary digits of the MAC address represent a code for the manufacturer of the card, and the second six digits signify the serial number for the network card. The address is permanently associated with each network adapter card, so it is not possible to change it. It consists of both letters and numbers.