The channel launched in December 2006 and was Nintendo's first big foray into a digital media download service on its consoles. It reflected Nintendo's perpetual caution around online features (hence the Wii Points system), but it also freed you from having to buy physical copies at a time when that was still a novelty for many gamers. How many Wii owners remember downloading their first WiiWare title or Virtual Console flashback? It even became a bit of a cultural phenomenon -- there's a good chance you remember the Wii Shop Channel's synth-laden bossa nova soundtrack by heart.
You probably won't wax nostalgic for too long if you own a Wii U or Switch. The channel's successor, the eShop, is clearly an improvement with direct purchases and a catalog that includes more of the games you see in retail stores. Even so, we wouldn't blame you for shedding a few tears. While the Wii enjoyed one of the longest runs in console history (you can still buy new games for it), it's that much closer to fading away.