Discovering GeoAnalytics (or what is GeoAnalytics, and why should I care?)

GeoAnalytics is one of the new server roles now available with ArcGIS Enterprise, released at 10.5. You may already have heard about it or seen one of the hugely impressive (and impressively huge) demos at recent events. Perhaps you're still wondering what GeoAnalytics is, how it works and how you can use it in your organisat