I'm new at this (studying for a masters of GIS) and trying to understand the WGS84 geographic coordinate system as presented in ArcPro
WGS84 is a datum and reference ellipsoid EPSG 4326 is WGS84 using latitute and longitude as a coordinate system The data is have is being represented in ArcPro in WGS84 with lat/lon coordinates, so really EPSG 4326.
However, WGS84 is an ellipsoid, while the representation I see in ArcPro is flat. So the coordinates are being projected in some way. My lecturer assures me that there is no projection. When I use the "measure distance" tool the line between two points is curved since it's a geographic system. I get that, that part is fine. But the map is still flat, so I keep insisting there has to be some sort of projection. If there was no projection I'd be looking at an ellipsoid. What am I missing?