I can understand what does it mean when people are talking about ArcGIS Server but not understanding what is the ArcGIS Client and what is the ArcGIS Portal for?
Can you please let me know what are these two concepts?
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A client is any application that consumes one or more services, so a client may be service that consumes another service. Similarly most (web) portals are clients. Literally they (portals) provide a window onto data provided by others (usually) through services.