Arduino is an open-source electronics platform based on easy-to-use hardware and software. Unlike the Raspberry Pi, Arduino is primarily a microcontroller board, which is excellent for interacting with the physical world. It’s used in projects where sensors, actuators, and real-time control are needed. Arduino boards are perfect for projects like controlling motors, lights, and other devices, making them a go-to platform for hobbyists, educators, and engineers building prototypes and interactive systems.