An NSP is essentially the digital eShop version of a game. It is installed directly to the Switch’s internal memory or SD card.
: These files are direct dumps from physical retail game cartridges. Unlike NSPs, XCI files can often be run directly as if a physical card is "inserted" into the system, though they are frequently larger because they include "padding" data to match standardized cartridge sizes. The Significance of Update 3.0.0 mario kart 8 deluxe switch nsp xci update 30 repack