Can i use DDR4 RAM on a DDR5 compatible motherboard?

Customers can find memory sticks from DDR4 and DDR5 RAM standards with BUS Speeds available from 1333 MHz to 7600 MHz RAMs And the incremental value in between

No support for Intel Optane Persistent Memory New DDR5 memory offers significant performance improvements over DDR4; Support for lower-cost 9x4 DIMMs

ddr4 vs ddr5 slot They support the latest DDR5 RAM modules and technologies like HEVC, HDR, and VP9 10-bit encoding alongside Hi-speed USB ports and DDR4 RAM slots

ddr4 sodimm slot RAM is RAM But what kind? DDR4? What even is the difference between DDR4 and DDR5