Lightning Aura Components Developer Guide

What Is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Aura Component Bundle Design Resources
Use Aura Components in Lightning Experience and the Salesforce Mobile App
Navigate Across Your Apps with Page References
Get Your Aura Components Ready to Use on Lightning Pages
Use Aura Components in Experience Builder
Use Aura Components with Flows
Considerations for Configuring Components for Flows
Flow Screen Components vs. Flow Action Components
Which Custom Lightning Component Attribute Types Are Supported in Flows?
Design Attribute Considerations for Flow Screen Components and Local Actions
Runtime Considerations for Flows That Include Aura Components
Customize Flow Screens Using Aura Components
Create Flow Local Actions Using Aura Components
Embed a Flow in a Custom Aura Component
Display Flow Stages with an Aura Component
Add Components to Apps
Integrate Your Custom Apps into the Chatter Publisher
Using Background Utility Items
Use Lightning Components in Visualforce Pages
Add Aura Components to Any App with Lightning Out (Beta)
Lightning Container
Communicating with Events
Communicating Across the DOM with Lightning Message Service
Creating Apps
Styling Apps
Developing Secure Code
Using JavaScript
Working with Salesforce Data
Testing Components with Lightning Testing Service
Debugging
Performance
Reference
PDF

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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