The lines of this printed circuit material are called traces. The printed circuit board manufacturing process is finished by washing the board in a neutralizing bath of water to remove any traces of etchant that may remain.
The most common type is the plated hole that is used in printed circuit board (PCB) manufacturing
. Plating the hole makes it easier for electrical signals to be transmitted along the PCB, but a through hole does not have to be plated if it is going to be used for mounting other hardware.