What does the X4 mean in an PCIe Gen X4 NVME drive?

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What does the X4 mean in an PCIe Gen X4 NVME drive? What is the point of even buying a video card that uses PCIe if people have motherboards that only have PCIe slots?

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pcie slot gpu It is also my understanding that Slot 4 is actually a SATA interface, however this means the remaining 3 slots, Slot 3, 5 & 6 should be PCIe 4x4

It'll surely be a bottleneck if you're using a PCIe or card in a PCIe slot Simply because the slot doesn't have enough

pcie nvme slot PCIe PCIe No PCIe Sold out Vertical GPU: up to 4 slots; horizontal GPU: 3 slots drive mounts

PCIe Vs PCIe on RTX 3060 12GB l 1080p Ad - 0:00 Games : Forza Horizon 5