When a Job is executed, each Action or Service can produce a results file by writing output to the results folder. To access those results, the Action or Service that immediately follows can download them using the runway download command. If the Action or Service is the last step in a Job, then you can manually download them. However, using a Service at the end of a Job allows you to automatically route the results without manual intervention.
To see a basic example of the download:file Service, see: