Because the Nintendo Switch uses a proprietary encrypted environment, an emulator cannot simply "read" a game file (like an XCI or NSP) without the proper authorization. The Prod Keys act as the digital handshake between the hardware and the software. Without them, the emulator cannot unlock the game’s data, resulting in an error message or a black screen.
The emulation landscape is always shifting. While Yuzu has faced significant hurdles recently due to legal pressures, the underlying technology of how Switch games are decrypted remains the same. Understanding the role of Prod Keys is the first step for any hobbyist looking to preserve their game library and enjoy their favorite titles on more powerful hardware.
Once the keys are generated, you move the prod.keys file from your SD card to your computer.