A MAC address (Media Access Control address) is a unique identifier assigned to network interfaces for communication on physical networks. MAC addresses are used in the Media Access Control (MAC) layer of the OSI model and are used for network devices such as computers, routers, and switches to identify and communicate with each other on a network.
MAC addresses are typically written in hexadecimal format and consist of six pairs of digits or letters, separated by colons, for example: 00:11:22:33:44:55. The first three octets of the MAC address identify the manufacturer of the network interface, while the last three octets are assigned by the manufacturer to uniquely identify the specific device.