AGOL: Is there a difference between a featur-layer and and a feature service? Would the correct wording be "hosted feature layer service" when publishing a service from ArcMap to ArcGIS Online?
Read Features vs. feature services in ArcGIS Online | ArcGIS Blog
A feature service may contain many layers; picture a geodatabase with feature classes and tables and relationship classes, the set may be published as a single feature service with layers 0,1,2 etc.
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