An NSP file acts as a digital installer, similar to an APK on Android or an EXE on Windows. It contains the game's core data, metadata, icons, and legal disclaimers. While physical cartridges use the format, NSPs are strictly digital and must be "installed" to the console's internal storage or a microSD card to function.
The base version of Smash Ultimate (v1.0.0) lacked several features, fighters, and balance adjustments. super smash bros ultimate nsp patched
Do you bother installing Switch patches for games? : r/OdinHandheld 29 Jul 2024 — An NSP file acts as a digital installer,