MAC addresses (Media Access Control addresses) are unique identifiers assigned to network devices, such as computers, smartphones, and printers. They are used to identify and track devices on a network, and to ensure that they can communicate with each other.
MAC addresses are important because they ensure that devices can be uniquely identified on a network. This is important for security purposes, as it allows network administrators to control access to the network and to track devices that are connected to it. MAC addresses can also be used to troubleshoot network problems, as they can help to identify which devices are causing problems.