Can someone ELI5 what this is and does it benefit someone like me who occasionally spins up VirtualBox VMs for various OSes?
I'm not an expert in this field, but my best TL;DR is that VirtualBox and other VMM's (virtual machine monitor) used to ship with their own hypervisors (the thing that let's you run virtual machines). However, now Linux has its own hypervisor/framework (KVM) and now VirtualBox can use KVM to do all the functionalities their own hypervisor used to do.
Someone please correct me if I'm wrong