Map Viewer - This app within the portal website allows you to view, design, and save web maps. The ArcGIS Enterprise portal website - At the front end of the portal, users sign in to search, use, and share content. Portal for ArcGIS includes the following: To learn more about how Portal for ArcGIS can be used, see An example of using Portal for ArcGIS in your organization. Geographic viewers are designed for those who are just beginning with GIS, while experienced GIS users can connect to the portal from ArcGIS Desktop, developer APIs, and other applications. The ArcGIS Enterprise portal makes GIS accessible for users of all experience levels.
The front-end ArcGIS Enterprise portal is powered by the back-end infrastructure of Portal for ArcGIS. Portal for ArcGIS is a component of ArcGIS Enterprise that allows you to share maps, scenes, apps, and other geographic information with other people in your organization.