From hackersonlineclub.com
What is MAC spoofing?
MAC spoofing is a method used to convert a Media Access Control (MAC) address assigned to a network communication factory to a network device. The coded MAC address in the network interface control (NIC) cannot be changed. However, many drivers allow the MAC address to be changed.
The MAC address of the computer is a unique identifier assigned to the network connection in the network segment data connection.
Media Access Control (MAC) address is a standard method of wireless network protection. This is where you configure your APs to enable only wireless clients with known MAC addresses to connect to the network. In that case, the most common hack to combat wireless networks, is to hijack the MAC address.