Connecting a video card, why are there ports if there is already a connection to the motherboard?

Question

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I understand a really stupid question, but I’m stupid and I can’t understand why there are ports on the video card and what’s the point of connecting it through them if the monitor is connected to the motherboard, sort of like

Answer 1

Through the ports on the motherboard, you connect the monitor to the graphics core of the processor , and the video card, it turns out, does not work. DOES NOT work. Because all frames rendered by the video card can only go out through the ports of the video card, but not through the ports of the motherboard. To use the power of the video card , you must connect the monitor to it .