A splitter is a composite adapter.
It manages a group of two or more 'sub-adapters'.
When it receives a granule through its input connection, it will send the granule to all of the sub-adapters that are willing to accept it.
It is used to create multiple parallel data flows in the data flow network.
The output connection of the splitter is not used. If none of the sub-adapters is prepared to accept a particular granule, then the splitter acts as a sink, and the granule disappears from the data flow.