In short: means “This is a clean, complete, and accurate copy—safe to archive or play.”
Visit (via their official DAT-o-Matic) or the Switch Backup Verification subreddit to find the known good SHA-256 hash for Xenoblade Chronicles: Definitive Edition . For example:
Xenoblade Chronicles: Definitive Edition is a remastered version of the original Xenoblade Chronicles (Nintendo Wii, 2010) released for Nintendo Switch. It updates visuals, audio, and quality-of-life features while preserving the core open-world JRPG design: real-time action-based combat with skill chains, a large explorable world, and a character-driven narrative focused on fate, memory, and interpersonal bonds.
In the context of the Nintendo Switch, an is a file format used for digital distribution of games and updates. Xenoblade Chronicles: Definitive Edition Review - RPG Site