Explain pure virtualization in brief.

Pure virtualization, also known as full virtualization, is a method of creating a virtual version of a hardware platform, operating system (OS), storage device, or network resources.

Here's a step-by-step explanation:

1. Hardware Simulation: In pure virtualization, the underlying hardware is completely simulated by the virtualization layer. This means that the software running on the virtual machine (VM) does not interact directly with the physical hardware. Instead, it interacts with a virtual representation of the hardware.

2. Operating System: Each virtual machine runs its own separate operating system. This OS believes it's running on actual hardware, not realizing it's a virtual environment. This allows for multiple different operating systems to run simultaneously on the same physical hardware.

3. Hypervisor Role: The hypervisor, or virtual machine monitor (VMM), is the software, firmware, or hardware that creates and runs virtual machines. It sits between the hardware and the virtual machine and is responsible for the management of the virtual machine instances.

4. Resource Allocation: The hypervisor also manages the system's resources. It allocates physical hardware resources such as CPU, memory, and storage to each virtual machine as needed.

5. Isolation: Each virtual machine is isolated from the others. This means that a problem in one VM, such as a crash or virus, does not affect the others. This isolation also provides a level of security, as VMs cannot access each other's data without explicit permission.

6. Performance: While pure virtualization provides a high level of abstraction and flexibility, it can lead to a slight decrease in performance compared to running the software directly on the hardware (also known as bare-metal). This is due to the overhead of the hypervisor managing the virtual environments.

In summary, pure virtualization allows for the creation of multiple, isolated virtual machines on a single physical machine, each with its own operating system and resources.