Why are there two black wires connected to the bottom of my three-way switch? - Home Improvement Stack Exchange

I am installing a new 3 way switch. When I open up the existing three way I see two back wires connected that the bottom, one black in the top and one white at the top. Can someone advise what the

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electrical - Two switch with three black wires - Home Improvement

Why are there two black wires connected to the bottom of my three

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