What Function Does PCB Board Offer for Electronic assembly manufacturing Products?

Whether PCB circuit boards, aluminum PCB or single-sided PCB,they all have a common name, that is a printed circuit board (PCB) or printed wireless board (PWB), then what function does PCB board offer for electronic assembly products. The function that PCB boards provide for electronic assembly products 1. Assurance integrated circuits and other electronic components fixed, and support mechanical assembly  . 2. Ensure the quality of the electronic equipment, improve the labor productivity, reduce the cost and easy to maintenance. 3. Provide resistance welding graphics for automatic soldering,provide identification of characters and graphics for components instrumentation, inspection, maintenance. 4. Implementation electrical connections or [...]