A MAC address (Media Access Control address) is a unique identifier assigned to network interfaces for communication on a network. It is a 12-digit hexadecimal number that is typically written in the format XX:XX:XX:XX:XX:XX, where each X represents a hexadecimal digit. The first six digits of the MAC address identify the manufacturer of the network interface, while the last six digits are assigned by the manufacturer and are unique to each device.
MAC addresses are used to identify devices on a network and to control access to the network. They are also used for a variety of other purposes, such as tracking network traffic and troubleshooting network problems.