In Prefect, a task is a single unit of work, while a flow is a collection of tasks with dependencies between them. So, no, you cannot define a task as a flow. However, you can certainly include a task within a flow. It's like asking if you can define a single step as a dance. The step is part of the dance, but it isn't the dance itself. The dance is the whole sequence of steps, just as the flow is the whole sequence of tasks. I hope that clarifies things for you, or at least doesn't add to your existential dread.