Flexible PCBs, or flexible circuit boards (FCBs), function similarly to their rigid counterparts, wherein the electronics are placed on a flexible substrate rather than a rigid platform.

Core Characteristics and Production Practices of Wet Film Technology for Circuit Boards The wet film technology for circuit ...

Through-hole assembly means bending leads on components and putting the leads through holes in the circuit board, then soldering them in place, and trimming the wires. That took up too much space ...