Source service. A source service collects data from a data source and publishes the data. You can run a source service on a machine that either hosts the data source or can access it.
Target service. A target service receives data from one or more source services and writes the data to a data target. You can run the target service on a machine that either hosts the data target or can access it.
Aggregator. An aggregator collects data from source services or other aggregators and publishes the data to target services or other aggregators.
Transformation. A process that transforms the data that a source service or aggregator publish or the data that a target service or aggregator receive, or both. A transformation runs on the EDS Node that contains the source service, the target service, or the aggregator.