...
The launch_cvd command rus two commands assemble_cvd and run_cvd in its child processes. If both commands work as expected, the Android can launch successfully on Cuttlefish machine. The assemble_cvd command generates root file system images with overlay / qcow2 overlay format, then the run_cvd command invokes the virtual machine manager (either Crosvm or QEMU) to boot the generated images on virtual machine. The diagram below shows the Cuttlefish flow.
...