What type of hypervisor runs directly on the host machine?

A Type 1 hypervisor, also known as a bare-metal hypervisor, runs directly on the host machine's hardware. This type of hypervisor does not require a separate operating system to function, enabling it to provide better performance and efficiency for virtual machines compared to other hypervisors. Since it interacts directly with the physical resources of the host, it can manage these resources more effectively and allocate them to different virtual machines as needed.

Type 1 hypervisors are typically used in enterprise environments where performance, scalability, and resource management are crucial. They are often found in data centers and server virtualization scenarios. Notable examples of Type 1 hypervisors include VMware ESXi, Microsoft Hyper-V, and Xen.

In contrast, Type 2 hypervisors operate on top of a conventional operating system, which can introduce latency and resource overhead since they need to go through the OS to access the hardware. The incorrect options do not refer to standard classifications of hypervisors recognized in virtualization technology.