Explain What Is Meant By A MAC Address?

Media Access Control address (MAC address). It's a code that's hardwired into your NIC [Network Interface Card - please make anyone that says 'NIC Card' stop doing that, it's redundant... ;) ] chipset that identifies the specific device that is accessing/requesting network data...

The Wikipedia has a VERY in-depth description here.

Hope that helps. Have a great day...

Asuka Jr.