A workflow is a special type of task that uses document status values (e.g. Initiated, In Progress, Complete, Approved, Terminated). There can only be one workflow per document and the status of the document is the workflow status. It can have a current priority, due date and assigned to like other tasks and can use comment labels. Workflows can be created on multiple documents at the same time (using batch processing) but they are independent from each other.
We should re-use article from help but expand technical aspects.