Mapplet input.

You can pass data into a mapplet using source definitions or Input transformations or both. When you use an Input transformation, you connect it to the source pipeline in the mapping.

Mapplet output.

Each mapplet must contain one or more Output transformations to pass data from the mapplet into the mapping.

Mapplet ports.

Mapplet ports display only in the Mapping Designer. Mapplet ports consist of input ports from Input transformations and output ports from Output transformations. If a mapplet uses source definitions rather than Input transformations for input, it does not contain any input ports in the mapping.