The NSP format is the standard package format for the Switch. The [BASE] tag means it is the core game file without additional updates or DLC.
It looks like you’re looking for information on a specific file release, likely for a Nintendo Switch game (indicated by , BASE , and NSP ). WITCHOTHOLNGHT-(USA)-NSwTcH-[BASE]-NSP-Ziperto....
Set in the late 1980s, it follows Aoko Aozaki as she enters the world of magecraft under the tutelage of a young witch, Alice Kuonji. The NSP format is the standard package format for the Switch