MAC addresses are always a 12 digit hexadecimal number, with the numbers separated every two digits by a colon or hyphen. MAC addresses are used to identify which device is which on your local network so that data gets sent to your computer and not your roommate's smartphone. MAC addresses work with the card in your device that lets it connect wirelessly to the internet, called a Network Interface Controller (NIC).
Wi-Fi, Bluetooth, and Ethernet connections all use MAC addresses. Other names used for MAC addresses include: MAC addresses are associated with specific devices and assigned to them by the manufacturer. One of those critical elements is the media access control (MAC) address.
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