Switch allows you to connect two flows (each doing part of the processing), while remembering the original folder structure, so the files can be placed in the right folder.This is useful if a process is divided over two different workflows, for example the images are processed in one workflow and then rejoined to a layout document so a PDF can be created with the modified images.
If the first flow places the processed files in the output folder, these files can be picked up immediately by the second flow.