WADs from projects like WiiLink that bring back defunct features like the News and Food Delivery channels. How to Install Wii WADs Safely
A (Wii Archive) is a file format used by the Nintendo Wii to install content directly to the console's internal memory (NAND). When you see a "channel" on your Wii Menu—like the Forecast Channel or a game—that data was originally packaged in a WAD file. Common types of WAD files include:
Essential software modules the Wii uses to run games and hardware.