The Raspberry Pi 400 is a personal computer built directly into a compact keyboard, integrating a Raspberry Pi 4's power (quad-core 64-bit CPU, 4GB RAM) with essential ports (USB 3.0/2.0, Gigabit Ethernet, dual Micro HDMI) for a ready-to-use desktop experience, ideal for browsing, coding, and learning, featuring a horizontal GPIO header for hardware projects and excellent passive cooling for quiet performance.