Guide to Creating and Managing Virtual Tables for Databases

Create and edit virtual tables that contain data from an external data source

A virtual table is a custom table in Microsoft Dataverse that has columns containing data from an external data source. Virtual tables appear in your app to users as regular table rows, but contain data that is sourced from an external database, such as an Azure SQL Database.

https://learn.microsoft.com/en-us/power-apps/maker/data-platform/create-edit-virtual-entities

Microsoft Dataverse

Microsoft Dataverse (formerly known as Microsoft Common Data Service) is a cloud-based data platform that enables users to build custom business applications that connect to data stored in the cloud. It is a part of the Power Platform, a collection of business application platforms that allows users to create custom business applications and automate workflows. Microsoft Dataverse provides a set of tools and services that allow users to create and manage data entities, forms, and views, and to build custom business logic using Microsoft

Power Automate and Microsoft Power Apps. It is designed to be used by business analysts and developers to create custom business applications that meet the specific needs of an organization. Microsoft Dataverse is a cloud-based service, so it does not require any hardware or software to be installed on the user's computer.

https://learn.microsoft.com/en-us/power-apps/maker/data-platform/data-platform-intro