you are probably thinking about qemu system emulation, simulating a whole computer? There's also qemu user space emulation which would fit the quoted descriptio

you are probably thinking about qemu system emulation, simulating a whole computer? There's also qemu user space emulation which would fit the quoted description: https://qemu.readthedocs.io/en/latest/user/main.html https://qemu.readthedocs.io/en/latest/user/main.html