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 ## Device and DeviceManager
 
+---
+[YouTube Video - The Device Model in PepperDash Essentials](https://youtu.be/QF4vCQfOYGw)
+***
+
 A `Device` (`PepperDash.Core.Device`) is a logical construct. It may represent a piece of hardware, a port, a socket, a collection of other devices/ports/constructs that define an operation, or any unit of logic that should be created at startup and exist independent of other devices.
 
 `DeviceManager` (`PepperDash.Essentials.Core.DeviceManager`) is the collection of all Devices. The collection of everything we control, and other business logic in a system. See the list below for what is typical in the device manager.