Explanation

Box 1: Microsoft Flow
Microsoft Flow, now called Power Automate, is cloud-based software that allows employees to create and automate workflows and tasks across multiple applications and services without help from developers.
Box 2: Power Apps
PowerApps is a suite of apps, services, connectors and data platform that provides a rapid application development environment to build custom apps for your business needs.
Box 3: Power BI
Power BI is a business analytics solution that lets youvisualizeyour data and share insights across your organization, or embed them in your app or website. Connect to hundreds of data sources and bring your data to life with live dashboards and reports.
Reference:
https://docs.microsoft.com/en-us/powerapps/powerapps-overview