Printed circuit boards were invented a long time ago.
Remarkably, they began to be used en masse more than a century ago.
Structurally, the product is a flat base (usually rectangular in shape, but there may be variations, especially in consumer electronics, where the geometry of the device body is often essential). Trunk lines are applied to the plate in accordance with the scheme.
Printed circuit boards also have holes and areas for soldering electronic devices.
PCBs in consumer electronics