Workflow is a simple reference data table, which specifies minimum number of steps provided to a customer. List of workflows has only one column:
Editing view also includes a table with steps included in a workflow:
Currently, workflows are used only to help you to quickly create translation assignment in translation projects. This is described in the Translation assignments and translation assignment tasks article.
It was mentioned that workflow defines minimum number of steps. This means that actual workflow (number of created assignments over a translation job) could differ and include additional work types, if user manually creates additional job tasks. For such tasks, which are not included in a workflow, translation assignments will also be created automatically, but these tasks will be combined with a last step of workflow and be included in the last translation assignment created for a particular translation job.