A flexible PCB (flexible printed circuit board) is a type of circuit board that is made from flexible materials, allowing it to bend and conform to various shapes. Unlike traditional rigid PCBs, which are inflexible and fixed in shape, flexible PCBs can be twisted, folded, and rolled, making them ideal for applications where space and weight are critical.

Flexible PCBs typically consist of a base material, usually polyimide or polyester, that is coated with conductive copper traces. This structure allows for the creation of complex circuits while maintaining flexibility. The ability to integrate multiple layers into a single assembly further enhances their functionality, enabling intricate designs that would be difficult to achieve with rigid boards.