Is DDR4 RAM compatible in a DDR3 RAM slot?

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ddr4 vs ddr5 slot What if i have 4×16 ddr4 and i have 4 slots free and i want to add 2 memory , 2×32 ddr4 Motherboard is Fatal1ty X99 Professional Gaming i7 and CPu , e5-2698 v3

ddr4 slot vs ddr5 No DDR4 stands for “Double Data Rate Fourth Generation”, so the 4 at the end of DDR4 stands for “fourth generation”, the same as DDR3, the 3 Is DDR4 RAM compatible in a DDR3 RAM slot? The Question: I'm looking to get a RAM