What is DNS ? well it means “Domain Name System” and it relates to the fact that no matter
how good our memory is, it is easier for us to remember names than numbers. Since any computer/device that is attached to a network, no matter if the network is local or external (Internet), that computer has an IP address (which is how any device is being recognized and attached to the network). Since it might be easy to remember one address (maybe), if you have more than one computer on the network this trick might become a bit complex, so the solution is to turn network IP’s into names.
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Mostly because you can use Skype to send and receive files (without supervision), use video chats (which might show your office, and things that might not be allowed to be seen), and of course opens online chats to the world with much difficulty to monitor and supervise. 
operating system needs to be able to recognize the devices you are plugging into the computer. The Idea is that in order to work properly with the devices that has been plugged in, the operating system needs to know what it is, how to work the device, and how to enable you to use it by giving you the tools to access and operate it properly. 
is what computer support technology is all about. Since support is part of computer life, and there are always bugs, problems, guidance etc… that needs to be given by some sort of a support entity, we can expect ways that will help us receive that much needed support.
There are those who would like to build their own computer so they can save money, by buying the parts they need, for the most basic computer (not that this is necessary true always) but in some cases it might work. 
from our stored selected folder no matter where we are? Well there are solutions for those kind of needs and they are called digital media servers or digital music servers. 
Linux operating systems are no different. Since Linux has two different operating system environment, one a server operating system, that usually doesn’t have a GUI desktop (X-Windows), and the Desktop operating system edition, which does come with the GUI (X-windows) built-in, and is similar to what most people know as the Microsoft operating systems (Windows XP, 7, Vista etc….).