At its simplest, Desired Configuration Management allows you to check your Configuration Manager clients to see if they are compliant with the settings you specify, but there is much more to it than that.
Users Are Not Configuration Manager Clients
While Configuration Manager allows you to easily create collections based on users and you can apply DCM baseline configurations to a collection of users, it is the agent on the computer that runs the compliance check and not the user.
What does that "more" consist of? Here are some of DCM's most powerful features and capabilities:
The vast number of settings that you can check for compliance
The capability to assemble configuration items into configuration ...