A circuit board is a flat piece of material, usually made of fiberglass or plastic, that connects electronic components. It has conductive pathways, often made of copper, which allow electricity to flow between different parts of a device. These boards are essential in many electronic devices, including computers, smartphones, and televisions. The most common type of circuit board is the printed circuit board (PCB), which is designed to hold and connect various components like resistors, capacitors, and integrated circuits. Circuit boards help organize and simplify the design of electronic devices, making them more efficient and reliable.