ArcGIS Enterprise is comprised of four components that work together to provide comprehensive functionality for web mapping, image exploitation, real-time data handling, large-volume batch analysis, and spatial data science:
✔ ArcGIS Server (includes ArcGIS Server Manager)
✔ ArcGIS Web Adaptor
✔ ArcGIS Enterprise Portal
✔ ArcGIS Data Store
SDE and SQL are also typically components.