Note: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.

Flow Screen Components vs. Flow Action Components

You can make your Aura component available in flow screens or as a flow action. When choosing between the flow interfaces, consider what purpose the component serves in the flow.
For this use case... Create a...
Provide UI for the user to interact with Flow screen component
Update the screen in real time Flow screen component
Prevent the flow from continuing until the component is done Flow action component
Make direct data queries to on-premise or private cloud data Flow action component