What is Microsoft Power Apps?
Microsoft Power Apps is a suite of applications, services, connectors and a data platform that provides a rapid application development environment to build custom apps for business needs. With Power Apps, you can quickly build custom apps that connect to your data stored either in the underlying data platform (Microsoft Dataverse) or in various online and on-premises data sources (SharePoint, Microsoft 365, Dynamics 365, SQL Server, and so on).
Sourced from https://learn.microsoft.com/en-us/power-apps/powerapps-overview.