Through hole is also called Plating Through Hole. PTH is abbreviation of Plating Through Hole. This is the most common kind of hole, as long as the PCB held up to the light, you can see the bright hole is the”Through hole”. This is also the simplest kind of hole, because when you use a drill or laser directly to drill the board can be done, the cost is relatively cheap.
But in contrast, there are some circuits that don't need to be connected to these openings. For example, we have a six-story house, and I bought its third and fourth floors. I wanted to design a staircase that would only connect the third floor to the fourth floor. For me, the fourth floor was invisibly taken up by the original staircase connecting the first floor to the sixth floor. Therefore, although the through hole is cheap, sometimes it will use up some PCB space.
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