What Is the Expansion Slot, and How Can I Use It

NVMe SSD to PCIe x4 Expansion Slot m2 expansion slot My ten year old PC uses DDR3 memory and PCIe expansion slots, the x16 slot is occupied by the graphics card, no slot on the motherboard m2 slot pc Mini PCI-E PCI Express to PCI-E 1x Adapter With SIM card Slot US $22 Expansion Slot WiFi Interface to M2 NVME Support 2230-2280 M2 SSD US $

m2 expansion slot M2 SATA for m2-ssd and M2 NVMe PCI high speed drives NOT ALL M2 When asking for help Please state the make and