Archive of the former Yahoo!Groups mailing list: Homebrew PCBs
Subject: Re: [Homebrew_PCBs] What is a Via?
From: DJ Delorie <dj@...>
Date: 2010-03-31
A via is a hole in the PCB that lets you connect copper on different
layers. While they're physically the same as the holes for component
leads, PCB keeps them separate so that you can do things like "select
all vias" or "increase all pin sizes by 5 mil".
Note that PCB automatically adds vias if you're drawing a trace (line
tool) and select a different layer (number keys).