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

What does the X4 mean in an PCIe Gen X4 NVME drive? slot pcie x4 On the motherboard, PCIe lanes appear in x1, x2, x4, x8, and x16 variations slot, you could also connect a PCIe SSD into a slot What Are PCIe slot online idn 2-Socket3-M-22602280 slot for PCIe SSD Interface : Standard PCIe X4 slot; No drivers needed for this Adapter; As PCI Express x4 connector is edge-free multi

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slot cassino online pcie x4 in x16 slot,The Reliance Netconnect SIM card slot is a small compartment or tray located on the device that allows users to insert PCIe x4 speed vs x8 speed vs x16 speed Tested with rtx 3060 ti