Arduino Shield

An Arduino shield is an add-on board that attaches on top of an Arduino microcontroller, expanding its capabilities. Think of it like attaching a specialized module—such as for Wi-Fi, sensors, or motor control—to make the Arduino do more without changing its core. Shields stack onto the main board, connecting via pins, and allow users to easily incorporate complex functions into their projects. They simplify development by providing pre-made hardware interfaces, enabling quicker and more reliable integration of various components.