A MAC address (Media Access Control address) is a unique identifier assigned to a network interface card (NIC) or other network devices. It is a 48-bit address, typically written as a sequence of six hexadecimal digits, separated by colons, for example, 00:11:22:33:44:55.
MAC addresses are used to identify devices on a network and to control access to the network. They are also used for traffic analysis and network management. MAC addresses are typically assigned by the manufacturer of the network device, but they can also be changed by the user.