Use an Output transformation when you want the mapplet to pass data to one or more downstream transformations. When you use the mapplet in a Mapplet transformation, each Output transformation becomes an output group. Each output group can pass data to one or more pipelines in a mapping.
Use a Target transformation when you want the mapplet to write data to a target. When you use a Target transformation with no Output transformation, the mapplet is the last object in the mapping pipeline.
A mapplet must contain at least one Output transformation or Target transformation.
For information about configuring Output and Target transformations, see