Web maps and scenes
GIS maps and scenes (their 3D counterparts) are the primary user interfaces by which work is done with ArcGIS. They contain the payload for GIS applications and are the key delivery mechanisms used to share geographically referenced information on the ArcGIS platform.
Every GIS map contains a basemap (the canvas) plus the set of data layers you want to work with. If it’s 2D, it’s called a “web map.” These are examples of two-dimensional web maps.
If it’s in 3D, it’s called a “scene.” Scenes are similar to web maps (they combine basemap layers with your operational overlays), but scenes bring in the third dimension, the z-axis, which provides additional insight to study certain phenomena. These are examples of scenes.