All core vRealize Automation workflows are executed in a distributed execution environment.
The vRealize Automation runtime environment consists of one or more DEM Worker instances that can execute any workflow installed in the core engine. Additional Worker instances can be added as needed for scalability, availability and distribution.
Skills can be used to associate DEMs and workflows, restricting execution of a given workflow to a particular DEM or set of DEMs with matching skills. Any number and combination of skills can be associated with a given workflow or DEM. For example, workflow execution can be restricted to a specific datacenter, or to environments that support a specific API the workflow requires. The vRealize Automation Designer and the CloudUtil command-line tool provide facilities for mapping skills to DEMs and workflows.
For more information about distributed execution and working with skills, see Life Cycle Extensibility.