Can I plug DDR5 RAM into the DDR4 motherboard socket?

can i put ddr3 in ddr4 slot   Dan can nvme be used in m2 slot

DDR4 The latest AI Overclocking system sets speeds automatically based on silicon and cooling quality, and can train continuously to optimize

Bargain Hardware is Europe's leading supplier of refurbished business class IT hardware including, servers, workstations, desktop PCs, laptops and Every DDR generation is different from the others DDR4 is not backward-compatible with DDR3 so a DDR4 DIMM will not fit on a DDR3 DIMM slot

crystal slot machine AMD B550 ATX DDR4 Wi-Fi 6E Motherboard - Black Model: B550TMHWKWIFI SKU: 6504286 MSI - B550 TOMAHAWK MAX WIFI AMD B550 ATX DDR4 Wi-  With major changes to its physical design, specifications, and features, motherboards with DDR4 slots cannot use DDR3 RAM, and DDR4 RAM can't be