The Nintendo DS, launched in North America on November 21, 2004, revolutionized handheld gaming with its innovative dual-screen design and touch-based gameplay. "DS" stands for "Dual Screen" and "Developers' System", reflecting the console's breakthrough approach: two LCD screens housed in a clamshell (like the GBA SP), with the bottom screen using resistive touchscreen technology operated by an included stylus. This 32-bit portable introduced transformative features including a built-in microphone, wireless connectivity for local multiplayer, online play via Nintendo Wi-Fi, and the innovative PictoChat app for wireless messaging and drawing. The DS achieved staggering commercial success, selling an astonishing 154.02 million units worldwide, making it Nintendo's best-selling system, the best-selling handheld ever, and the second best-selling console after PlayStation 2. Its revolutionary library redefined portable gaming through touch-driven titles like Nintendogs, Brain Age, Phantom Hourglass, Elite Beat Agents, the Professor Layton series, alongside traditional hits like New Super Mario Bros., Mario Kart DS, Pokémon Diamond/Pearl, and Animal Crossing: Wild World.