What is a workflow?

A workflow is a sequence of activities performed in a specific order.

WWF provides a common workflow technology for Windows, through which
each step in a process can be explicitly defined (rather than
intertwining its logic in code) and then executed by a workflow
engine.

Each activity can be represented by a class, and can per se contain
any work that the workflow's creator wants. Activities can thus also
be reused across different workflows, making it easier to create
automated solutions to new problems.