image tile package
An image tile package is a read-only data file containing static, pre-rendered image tiles. It can be created from an image tile service, or by ArcGIS Pro. It is often used in offline applications that never have a network connection, but can also be used as a local basemap by an offline map. Image tile packages are used by applications built with ArcGIS Runtime APIs. There are two file formats for an image tile package: TPKX and TPK. Both TPKX and TPK are supported by ArcGIS Runtime APIs and ArcGIS Pro. TPKX follows the Open Tile Package Specification.