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What is Operating System?

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Hardware is nothing but finely  designed machinery. A machine is ultimately a machine only,which is always made to work. In case of computers, it is either us if we do that or some other which does it for us. This some other is nothing  but our very  own operating system.    Operating system is just like our secretary. As the boss gives orders to his secretary and the secretary does all work for his boss. The secretary himself decides: How to do? what to do ?;etc Same way we pass our orders/requests to operating system and operating system does it for us. Operating system itself decides: How to do?; What to do?;  When  to do ? The primary goal of an operating system is thus to make the computer system convenient to use and secondary goal is to use computer hardware in an efficient manner.      An operating system is an important component of a system which controls all other components  of  a computer of a computer system are.      1. The Hardware    2. The Operating System
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What is function in javascript

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f unction are used to encapsulate code that performs a specific task. Sometimes functions are defined for commonly required tasks to avoid the repetition entailed in typing the same statements over and over . More generally, they are used to keep code that performs a particular job in one place  in one order to enhance reusability and program clarity.           JavaScript function are declared with the function keywords, and the statements that carry out their operations are listed in curly braces. Function  arguments are listed in parentheses following the function name and are separated  by commas.   For example: function add (a, b) { var sum =  a+b; return sum; } This code declares a function named  add  that adds its argument  together and  "returns"    the resulting value. The return statement tells the interpreter what value the function evaluates to. For example, you can set the value of the function equal to a variable : var result = add(1, 2);
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What is MAC Address?

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The Address for a devices as it is identified at the Media Access Control(MAC) layer in the network architecture. MAC address is usually stored in  ROM(READ ONLY MEMORY) on the network adapter card and is unique.
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