Why run one OS when you can run many? This category covers everything related to virtualization — from hypervisors like XCP-ng, Proxmox, and VMware to containerization with Docker and LXC. Whether you’re consolidating workloads, spinning up test environments, or building out a full private cloud at home, this is the place to discuss VM configuration, resource allocation, snapshot strategies, storage integration, and everything in between. If it runs on top of something else, it belongs here.