A Media Access Control (MAC) address is a unique identifier assigned to a network interface controller (NIC). It is used to identify the device on a network and to ensure that data is sent to the correct destination. MAC addresses are typically written in a hexadecimal format, such as 00:11:22:33:44:55.
MAC addresses are important for network security. They can be used to track devices on a network and to identify unauthorized devices. MAC addresses can also be used to configure network access control lists (ACLs) to restrict access to certain devices or networks.