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A chunk of numbers that your device shoves out so it can talk to other devices without being a loudmouth. It's like the birth certificate of your phone, but way less fancy.
My Wi-Fi won't connect. My Mac Address is probably crying in a corner.
I tried to hack my neighbor's router. His Mac Address just laughed in my face.
My Mac Address is 00:1A:2B:3C:4D:5E. It's the only thing that makes sense in my life.