Workflows are definitions of how to aggregate data from a specific task, and just like tasks are shareable amongst users via "formulas."
Just like using tasks defined by other users, you can import workflow formulas that will build you a workflow from a pre-defined definition.
Many workflows will work with source collections (like a list of IDs to fetch data for). When you import a workflow with source collections, you'll create new collections with the same name as the author declared, however the contents will be blank. You just need to supply the collections with values to get started and can then execute the workflow normally.