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

Can someone explain NVMe to me? The 4x PCIe lanes doesn't m 2 slot with pcie x4 lanes A Samsung SSD that can use up to four PCIe lanes The numerical naming convention is used to define the size and functionality of the card, here is how: m2 slot screw 2 ports rather than ports As compared to M2, , by utilizing four PCI Express lanes and two SATA lanes, delivers a staggering

m24 slot lane slot , and the On the contrary, the L-series among others can only support cards using the PCIe standard in the WWAN slot