Rigid PCBs are the most common type of circuit board and provide a stable and firm foundation for electronic circuits. They are typically made from a rigid material like FR4, offering high strength and stability. These PCBs can exhibit a variety of layers and material combinations depending on the application to meet power capacity, signal processing, and heat dissipation requirements. They are used in a wide range of applications, including consumer electronics, computer hardware, automotive technology, and industrial electronics. Their stability and robustness make them a preferred choice for standard applications that do not require flexibility.