A Deployment Target contains the configuration for a Deployment Handler. It informs the handler about how to connect or what settings should be used when executing.
Deployment Targets are configured for Deployment Strategies as well as for Deployment Receivers.
When content is changed within Cloud CMS, a Deployment Strategy may decide to package up that modified content and deployment it to one or more Deployment Targets. Similarly, content may be deployed to a Deployment Receiver and the Deployment Receiver may have one or more Deployment Targets configured for it.