What is hypervisor Type 1 vs Type 2?
In the world of virtualization, the Hypervisor is the "manager" that sits between the hardware and the virtual machines (VMs). It’s the software that allows one physical computer to act like many.
However, not all managers work the same way. Depending on where the hypervisor sits in the tech stack, it is classified as either Type 1 or Type 2.
A Type 1 hypervisor is installed directly on the physical hardware of the computer. There is no operating system (like Windows or macOS) underneath it. It is the operating system for the hardware.
Since it sits directly on the "bare metal," it has direct access to the CPU, RAM, and storage. When a Virtual Machine needs resources, it asks the Type 1 hypervisor, which hands them over instantly.
Best For: Enterprise data centers and Cloud providers (AWS, Azure, GCP).
Performance: Excellent. Because there is no "middleman" OS, there is almost zero overhead.
Security: High. If one VM is compromised, the hypervisor is a very thin, hardened layer that is difficult to break through to reach other VMs.
Examples: VMware ESXi, Microsoft Hyper-V, Xen, KVM.
A Type 2 hypervisor runs as an application on top of an existing operating system. You engage with it just like you would with Spotify, Excel, or Chrome.
The hypervisor must go through the "Host" operating system (Windows, Mac, or Linux) to reach the hardware. If a VM needs more RAM, the hypervisor asks the Host OS, and the Host OS decides if it wants to give it up.
Best For: Developers, students, and home users who need to run a different OS for testing without wiping their main computer.
Performance: Slower. The "Host" OS consumes a lot of resources just to stay running, leaving less for the VMs.
Security: Lower. If the Host OS (e.g., your Windows laptop) gets a virus, every VM running on that Type 2 hypervisor is at risk.
Examples: Oracle VirtualBox, VMware Workstation, Parallels Desktop (for Mac).
| Feature | Type 1 (Bare Metal) | Type 2 (Hosted) |
| Location | Directly on Hardware | On top of an OS |
| Efficiency | Very High (Low Overhead) | Moderate (High Overhead) |
| Primary Use | Cloud & Servers | Personal PCs & Testing |
| Setup | Complex / Specialized | Easy / Like an App |
| Redundancy | High (Built for uptime) | Low (Dependent on Host OS) |
If you are reading this on a website, that site is almost certainly running on a Type 1 Hypervisor. Cloud providers need the "Bare Metal" approach because it allows them to pack as many customers as possible onto one server with maximum speed and security.
Type 2 hypervisors are great for "tinkering," but Type 1 is what keeps the modern internet scaling.