How does an electric circuit work where there are multiple switches? One light circuit in my house has four switches; three along a hallway and one downstairs. Using any switch either turns on all the lights or turns them all off regardless of other switches positions.
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That’s called “multiway switching”. Basically rather than opening/closing one wire like a regular circuit, there are two lines on the hot side (in addition to the neutral wire). Each switch swaps from one hot wire to the other. It’s easier to explain in a diagram (scroll down): https://en.wikipedia.org/wiki/Multiway_switching
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