First, let’s demystify the term. This is the proprietary content distribution network (CDN) that Nintendo uses to host and distribute official software for the Wii U and (previously) the Nintendo 3DS.
Navigating the Wii U NUS: A Guide to the Nintendo Update Server wii u nus
: This contains the encrypted title key your Wii U needs to "unlock" and run the game. First, let’s demystify the term
Modern homebrew tools have simplified using the NUS to the point where it acts as a "community eShop," especially relevant since the official Wii U eShop closed for new purchases. wii u nus