Date Z is likely a video game, possibly a survival or zombie-themed game, although I couldn't find more information about it. It's possible that it's a lesser-known or indie game.
The "-NSP-" in the file name might indicate that this update is specifically designed for a particular platform or region. NSP is a file extension often associated with Nintendo Switch game files, so it's possible that this update is for the Nintendo Switch version of Date Z.
"Date Z -NSP--Update 1.0.3-.rar" is likely a compressed archive file, specifically a RAR (Roshal ARchive) file, which contains an update for a game called "Date Z". The file name suggests that it's a patch or an update for the game, specifically version 1.0.3.