@Marvin how is a flow of flows different of a tasks within a flow. How is a task different to subflow

Great questions! In Prefect, a task is the basic unit of work, while flows and subflows provide structure and orchestration within your pipelines. Let's break down the differences: ### Flow of Flows vs Tasks within a Flow 1. Tasks within a Flow: - Tasks are the building blocks in Prefect. - Each task represents a single unit of work, which could be anything from a data transformation to a database operation. - Tasks are defined within a flow, and their execution is orchestrated by this flow. - Within a flow, tasks can have dependencies, ensuring that certain tasks are executed only after others. 2. Flow of Flows: - A "flow of flows" refers to a higher-level orchestration where you have multiple flows that are executed as part of a larger workflow. - Each flow can contain its own tasks and potentially other subflows. - This approach is useful for breaking down complex workflows into manageable, reusable parts. - A parent flow can trigger other flows (subflows), passing data between them and managing their execution. ### Task vs Subflow 1. Task: - As mentioned, a task is a single unit of work. - Tasks can be simple (e.g., reading data from a file) or complex (e.g., training a machine learning model). - Tasks are atomic and focus on a specific operation. 2. Subflow: - A subflow is essentially a flow that is called within another flow. - Subflows allow for modular and reusable workflows. - A subflow can contain multiple tasks and potentially other subflows. - Using subflows is a way to manage complexity in large workflows by breaking them into smaller, reusable chunks. To better understand the differences and implementation in the version of Prefect you're using, I can look up specific documentation for both Prefect 2.x and 3.x. Please let me know which version you're working with, or I can find out the latest version for you.

Is there anything I can do in a task which I can't do in a subflow

task runs can be cached, flow runs cannot