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The hypervisor, also known as a Virtual Machine Monitor (VMM) is the thin Layer Software which allows Multiple OS’s to run concurrently. It is responsible for creating the virtual environment on which the guest virtual machines operate. Dynamically partitioning and sharing the physical resources such as CPU, storage, memory and I/O devices. Also, abstracts the Hardware from the VM’s. Generally hypervisors are classified into one of two categories; Type 1 and Type 2.