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MAC



Two MAC are declared below :-
1.   A MAC is an address of a device which stands for media access control address. It is a uniquely identified address assigned to a network interface controller (NIC) for communications at the data link layer of a network segment. MAC addresses are used as a network address by many IEEE 802 network technologies, including Ethernet, Wi-Fi and Bluetooth. A network node may have multiple NICs where each NIC contains a unique MAC address. They are used in the medium access control protocol sublayer.
MAC addresses are represented as six groups of two hexadecimal digits, separated by hyphens, colons, or no separator.
A MAC address is also known as burned-in address (BIA), Ethernet hardware address (EHA), hardware address or physical address.
MAC addresses are assigned by the manufacturer of a NIC and are stored in its hardware, like ROM or some other firmware mechanism. A manufacturer's organizationally unique identifier (OUI) may be contained in MAC address.
The US National Security Agency has a system to track the movements of everyone in the city by monitoring the MAC addresses of their electronic devices. By knowing that the users being trackable by their devices' MAC addresses, Apple has started using random MAC addresses in their iOS line of devices while scanning for networks. Many vendors quickly followed MAC address randomization for scanning by adding in Android version 6.0, Windows 10, and Linux kernel 3.18.

2.   The Macintosh branded as Mac since 1998 is a family of personal computers designed, manufactured, and sold by Apple Inc. since January 1984. The original Macintosh was the first mass-market personal computer that featured a GUI, built-in screen and mouse. Macintosh systems still found success in education, desktop publishing. It kept Apple as the second-largest PC manufacturer for the next decade.
Mac
Apple has developed a series of Macintosh operating systems. They are :- 
a)  Mac OS 7.6 in 1997  
b)  Mac OS X (UNIX Based OS) in 2001       
c)  Mac OS in 2016
d)  macOS Mojave in 2018
 Apple does not license mac OS for use on non-Apple computers but Only one company, UMAX Technologies was legally licensed to ship clones running Mac OS 8.



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