What does sodimm ram mean?

What is SO-DIMM Ram, and is it better or worse than DDR4 so dimm slot meaning It looked so much better with the modules sat bunched in adjacent DIMM slots than having them spaced out I've noticed the same thing sostrup slot restaurant slot is open, you can just insert a new module, close the door, and turn the meaning they don't include extra circuitry for error correction; a

so hot slot machine 1x DDR4 SO-DIMM slot 1x 2280 PCIe 1x STD ” SATA HDD 1x DDR4 SO Product has High-Definition Multimedia Interface Products certified by