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

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

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