Qubes OS.
Qubes OS, which is also called the world’s most secure operating system, is a security-oriented system which performs virtualization by Xen hypervisor. For those who don’t know, a hypervisor mimics the hardware and allows running multiple virtual machines. The user environment for Qubes OS could be Fedora, Debian, Whoix, and Windows. Just like Tails Linux for security, Qubes OS too has been approved by NSA whistleblower Edward Snowden.
In Qubes, the isolation is performed by turning hardware controllers into functional domains. It also separates your digital life in different levels of trust, for e.g., work domain, shopping domain, random domain, etc. All these domains are run in different virtual machines. With this technique, one exploit doesn’t allow the attacker to take over the entire computer.
Virtual machines are Type 2 but Qubes is Type 1 or "bare metal" hypervisor.
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