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

What does the X4 mean in an PCIe Gen X4 NVME drive? can you put a pcie x4 in a x16 slot but since im using the first pci-express x16 slot with graphic card i can only use the second slot and second pci-express x16 slot conforms can i buy a slot machine for my home but since im using the first pci-express x16 slot with graphic card i can only use the second slot and second pci-express x16 slot conforms

can i buy a slot machine for my home If you have limited expansion slots on your motherboard and all you have available is an

candy village slot demo PCIe is backwards compatible so you can use a PCIe Gen 2 or 3 in a PCIe Gen 1 or whatever combination with little issue The biggest problem you hello dosto ,is video mai mene apko ye btaya hai ki kya hum PCIE x16 graphics