*** A JavaFX _Stage_, `javafx.stage.Stage`, represents a window in a JavaFX desktop application. Inside a JavaFX `Stage` you can insert a JavaFX `Scene` which represents the content displayed inside a window - inside a `Stage`. When a JavaFX application starts up, it creates a root `Stage` object, which is passed to the `start(Stage primaryStage)` method of the root class of your JavaFX application. This `Stage` object represents the primary window of your JavaFX application. You can create new `Stage` objects later in your application's lifetime, in case your application needs to open more windows. *** **References**: - [JavaFX Stage](https://jenkov.com/tutorials/javafx/stage.html)