Rigid-flex circuits are a type of printed circuit board (PCB) that combine both rigid and flexible materials. This design allows for complex shapes and configurations, making them ideal for compact electronic devices. They provide durability and reliability while saving space, which is crucial in modern technology. These circuits are commonly used in various applications, including smartphones, medical devices, and aerospace equipment. The integration of rigid and flexible sections enables better performance and easier assembly, as they can fit into tight spaces and adapt to movement without breaking.