SmartOS is a specialized Type 1 hypervisor built on the illumos kernel. It offers two virtualization paths: lightweight OS Virtual Machines (Zones) for containers and full Hardware Virtual Machines (KVM, Bhyve) for diverse guest OSes. The platform is a "live OS" that boots entirely from memory, leaving local disks free for VM storage.

This architecture leverages core illumos technologies like ZFS for storage, Crossbow for networking, and DTrace for introspection. Management tools `imgadm` and `vmadm` use a consistent JSON interface for programmatic control, a key differentiator for automation. SmartOS is also a foundational piece of the broader Triton Data Center ecosystem.

Installation involves copying a USB key image and configuring a ZFS pool on first boot. The global zone serves as the hypervisor management layer. As a community-driven project, it appeals to users seeking a secure, patch-resistant platform for hosting containers and VMs with the performance benefits of a single kernel.