What is the difference between a `service-name` and a `service-target`?

Consider the following commands

# launchctl stop 
Usage: launchctl stop <service-name>
# launchctl stop com.apple.SomeService
# launchctl disable com.apple.SomeService
Usage: launchctl disable <service-target>

What is the difference between a service-target and a service-name? How can I learn a service-target of a service from it's service-name?