What does x4 bandwidth mean on a PCIe x16 slot?

What is the difference between PCIe Gen 3 and PCIe Gen 4? pcie 2 0 x16 slot
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pcie slot length x, , , ) PCIe cards can always operate in PCIe slots with the Notice 'SLOT 13' are PCIe x16 slots but only Slot 3 has an x8 connection