Tile layers published to and hosted on ArcGIS Online support fast visualization of large datasets using a collection of predrawn map images or tiles. Hosted tiles provide geographic context for your operational layers. For example, you might include tiles of streets in your neighborhood to provide a visual reference for the street signs in your feature layer.
Tile layers hosted on ArcGIS Online are useful when you need to expose a map on the web for visualization, but you do not have your own ArcGIS Server. They’re also an easy way to share certain maps with an Internet audience if your own ArcGIS Server cannot be made public. WMTS is available for tile layers hosted on ArcGIS Online that are shared with the public.
Enable ArcGIS Runtime Tools
Create Tile Packages in ArcMap or ArcGIS Pro