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Light switch no power when on

NDtfe

I have this bathroom light switch, when I turned it on, I tested power between red and black wire, there is no power

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If I turned it off, there is power red/black line

How does it work exactly? I don’t understand this

UPDATE 1

According to answers below, this is a 3-way switch but it unnecessary because there is only one switch for the bathroom light. My goal is to move this switch to a different location. Right now it is OUTSIDE the bathroom. I want to turn it inside the bathroom. So should I continue to use this same switch and the way it is routed? Or should I take advantage of this and re-wire it?

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