Recommended
How PCB is Made in China - PCBWay - Factory Tour
Why people recommend it
Shared as a clear look at how a commercial board house makes circuit boards, useful for anyone who has not seen the industrial steps from artwork to finished panel.
Watch for: Process overview, not a design tutorial
In their words
According to this video ([video]) @ 3:39, it's an electroplating process.
Dan on electronics.stackexchange.com, Dec 2018. CC BY-SA.
