- Mechanical Support: It provides a stable, strong platform to mount and hold all the tiny, delicate electronic components (like microchips, resistors, and capacitors).
- Electrical Connection: The copper traces act as a highly organized, predefined wiring system. They accurately route electricity and data signals between the components according to the design, allowing them to communicate and function together as a complete system.
In essence, the PCB turns a “circuit schematic” (a conceptual drawing of the circuit) into a physical, functional object that can be mass-produced.