basemap
Optional layers in a map or scene that show background information—roads, landmarks, and so on—to help orient the user of the map or scene. Typically image tile or vector tile layer types. Basemaps can be composed of different layers organized in Basemap.baseLayers (displayed beneath other layers) and Basemap.referenceLayers (displayed on top of other layers). You can use ready-to-use basemaps, style your own with the ArcGIS Vector Tile Style Editor, or create and publish your own with ArcGIS Pro.