KVM(Kernel-based Virtual Machine)
The Linux virtualization technology that runs full virtual machines with near-native performance.
KVM powers the virtual machines in Proxmox and many cloud providers. It's ideal when you need a different OS or strong isolation, at a higher resource cost than containers.
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Hypervisor
Software that creates and manages virtual machines by allocating physical resources between them.
Virtual Machine(VM)
A software-based computer that runs its own operating system on top of physical hardware via a hypervisor.
LXC(Linux Containers)
Lightweight system containers that behave like a small VM but share the host kernel.