The view concept is the same as the ArcGIS Maps SDK for JavaScript, however in ArcGIS Experience Builder, the view is wrapped as Jimu to ensure a consistent extensibility model when creating widgets, message/actions, etc.
To create a Jimu object, a widget can use the Jimu method. A Jimu object has these main properties:
view: the map/scene view object.datasource: the data source (webmap/webscene) that creates the viewId map: the widget that creates the objectWidget Id jimu: the layer view object wrapperLayer Views
In Experience Builder, the Map widget creates the Jimu object. If a widget needs to use the Jimu object, it can use the Map component in the setting page to select a map widget. After it gets the map widget ID, the widget can use <Jimu to get the created Jimu object. The widget can use the Jimu component in the setting page to select the Jimu object as well.