A virtual machine (VM) on Proxmox is a full, isolated computer running inside a KVM/QEMU guest, with its own virtual CPU, memory, storage, and network interfaces. It behaves like a physical server and can run any compatible operating system in a completely separate environment.

A container on Proxmox is a lightweight, isolated operating system environment running directly on the host’s kernel using LXD. Containers share the host’s kernel but keep processes, filesystems, and network configuration separate, offering lower overhead and faster startup than virtual machines.