The Orchestrator server is responsible for distribution and launch of simple apply/rollback shell scripts in a particular order across multiple servers . If for any reason deployment is failing at a particular stage the process will stop and you can rollback any changes done until then.
In case you want to deploy your code or just call your preferred DSC client to apply the configuration locally the Orchestrator can be a handy tool.
The operation can be started manually or scheduled, depending on your needs.
In terms of audit and trace capabilities, the system is collecting all console output of your shell scripts from all servers and saves the logs centrally for review.