Virtualization

Basic information
To understand how Cloud works you should first learn something about virtualization. The possibility of virtualization is a revolution in IT. For example it is an advance for big companies. Before virtualization they had to own a great deal of physical computers - hardwares. Nowadays we can create multiple virtual machines (or VMs) using just one physical computer. Why is it such an advantage? For start, each of these virtual machines acts like a computer file - you can easily copy it and with one click create an identical software with everything in it. That saves companies a lot of time as they do not have to set each and every (physical) computer individualy. Another advantage is that the virtual machines "do not know" that they are virtual, they act just like the physical ones which helps with security as the hackers cannot get to the hardware.