Virtualization Technologies

A virtual machine is the emulated equivalent of a computer system that runs on top of physical system. Virtual machine try to represent same feature of actually machine (Computer). Where you can able to access Network, Storage, CPU, USB etc like an actual compute or machine, But those are not real, those shared from actual machine. This is very useful for Portability, Disaster Management, Easy Experiment etc.

A hypervisor is a program for creating and running virtual machines. Hypervisors have traditionally been split into two classes: type one, or "bare metal" hypervisors that run guest virtual machines directly on a system’s hardware, essentially behaving as an operating system. Type two, or "hosted" hypervisors behave more like traditional applications that can be started and stopped like a normal program. In modern systems, this split is less prevalent, particularly with systems like KVM. KVM, short for kernel-based virtual machine, is a part of the Linux kernel that can run virtual machines directly, although you can still use a system running KVM virtual machines as a normal computer itself.