The Output transformation is a passive transformation that you use to pass data from a mapplet to a downstream transformation.
Add output fields to the Output transformation to define the data fields you want to pass from the mapplet. You must add at least one output field to each output transformation. You can add multiple output transformations to a mapplet. Each Output transformation becomes an output group when you use the mapplet in a Mapplet transformation. You must connect at least one output group to a downstream transformation. You can connect an output group to multiple downstream transformations.
You can use an Output transformation in a mapplet but not in a mapping.