Base views are model documentation drawing views that are derived directly from a 3D model.
The first drawing view that you place in a drawing is a base view. During creation you specify the scale, display settings, orientation and alignment settings. Subsequent drawing views you place in the drawing are typically projected views derived from the base view. Projected views inherit most of their settings from the base view. When you change settings for the base view, projected views follow, by default. If required, these settings can be overridden in projected views. The overridden settings do not follow the base view.
Base views from AutoCAD 3D models contain all visible 3D solids and surfaces in model space, by default. However you can use command line options to create the base views for selected objects only.
Base views from Inventor 3D models show the view representations you select at the time the base view is created. View representations are similar to AutoCAD named views. However, unlike AutoCAD, Inventor provides several types of view representations that are independent of each other. As such, you might have to select more than one view representation, depending on the context.