What Is an NVMe Slot and What Does It Look Like?

Does any PCIe slot support NVMe SSD's automatically or do I need m2 slot mainboard But even with official server mainboards in case you have a dual NVMeSATA slot on the mainboard, most of the m2_1 slot An slot is a type of expansion slot found on modern motherboards that is primarily used for connecting solid-state drives

m2 slot pc slot has any pcie lanes or not and what gen they are my current mobo has a gen3 and 4 slot, so i use the fast drive for bootsoftware