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* A device represents hardware devices: a physical computational resource with processing capability upon which [[Artifact (UML)|UML artifact]]s may be deployed for execution. Devices may be complex (i.e., they may consist of other devices).<ref name= "OMG UML V2.1.2"/>
* An execution environment represents [[software container]]s (such as operating systems, JVM, servlet/EJB containers, application servers, portal servers, etc.) This is a node that offers an execution environment for specific types of components that are deployed on it in the form of deployable artifacts.<ref name= "OMG UML V2.1.2"/>
 
Execution environments can be nested. Nodes can be interconnected through communication paths to define network structures. A ''communication path'' is an "association between two DeploymentTargets, through which they are able to exchange signals and messages".<ref name= "OMG UML V2.1.2"/>