Virtual Entities
Virtual Entities is a feature in the Power Platform which makes it possible to display data from other systems in our Model-Driven Apps without having the data stored in the Common Data Service.
The concept o Virtual Entities consists of a virtual entity, a data source and a data provider. Either you can use one of the two built-in data providers (an OData v4 provider or an Azure Cosmos DB provider), or you can develop a Custom Data Provider if your data source requires that.
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Embedded Canvas Apps
Microsoft Docs
Get started with Virtual Entities
Create and edit Virtual Entities Take a look at the On-Premises documentation to get a better understanding for the overall process
[1] Blog Post from Microsoft
Community Content
Direct Query SQL Virtual Entities Article and Custom Data Provider by Michael Ochs
Virtual Entities - Series of 4 Articles Posts Articles and Customer Data Provider by Carina Claesson
Virtual Entities - Series of 3 Articles by Ivan Ficko
Blog Post and Customer data Provider by Jason Lattimer
Dynamics 365 working with the Virtual Entities by Alex Shlega