MAC Address

The MAC address associated with a particular network adapter (the hardware that allows your device to connect to the Internet, either wirelessly or through an ethernet cable) is one of several unique hardware IDs on computers, phones and other devices. Bluetooth adapters and mobile phone (GSM, 3G, LTE, etc.) “baseband radios” also have unique IDs. Since every network interface has a MAC address, and they are required to be unique, they are often used to uniquely identify a particular computer. However, software exists that allows you to temporarily overwrite your MAC addresses with a custom value. This can be a a good way to protect your privacy on public wireless networks.