Power Apps is a suite of apps, services, and connectors, as well as a data platform, that provides a rapid development environment to build custom apps for your business needs. It is a low-code platform that allows users to create feature-rich, custom business apps without writing code. Power Apps can connect to data stored either in the underlying data platform (Microsoft Dataverse) or in various online and on-premises data sources (such as SharePoint, Microsoft 365, Dynamics 365, SQL Server, and so on).

Power Apps provides three types of apps: canvas, model-driven, and portal. Canvas apps are designed for building custom user interfaces that can connect to a wide variety of data sources. Model-driven apps are designed for building complex business applications that can be easily customized and extended. Portal apps are designed for building external-facing websites that can be used to interact with customers, partners, or other external users.

Apps built using Power Apps provide rich business logic and workflow capabilities to transform manual business operations into digital, automated processes. They have a responsive design and can run seamlessly in a browser and on mobile devices (phone or tablet). Power Apps also provides an extensible platform that lets pro developers programmatically interact with data and metadata, apply business logic, create custom connectors, and integrate with external data.

In summary, Power Apps is a low-code platform that allows users to create custom business apps that connect to various data sources and provide rich business logic and workflow capabilities. It provides a rapid development environment and an extensible platform that can be used by both developers and non-technical users.