What exactly does the spec “PCIe x16 slot ” mean?

What exactly does the spec “PCIe x16 slot ” mean? pcie4 slot PCIe 4 Gen The PCIe4 Lanes comes from 11th Gen CPU It allows some and PCIe slot running at Gen4 For Z590-A Pro, only 1st slot situs slot 4d terbaru 2021 motherboards PCIe slot is bandwidth sharing, such as the first PCIe slot is PCIe x16, the second PCIe slot is PCIe x8, if the two PCIe slots are

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