What is SODIMM? What are its uses?

what is sodimm slot   Dan whats a pcie slot

ZOTAC Zbox,Sff, I7-13700Hx, Rtx4070 Laptop, 2X Ddr5 Sodimm Slot, Ssd Slot, WiFi, Bt, Dual LAN, 2X Dp, 1X Hdmi, EU+UK Plug

I have a Compaq CQ58 with 4Gb RAM in a single SODIMM I want to increase this to 8Gb Hold the module at a 45-degree angle to the slot and slide it into place No more than 116 of the gold contacts should be showing when the module is

slot aanhangwagen ThinkPad E14 Gen 5, which I ordered recently , have memory slots as well It also has 2nd SSD slot  The Legion 55 Pro and 7 all are this way Most non-gaming laptops have moved to soldered RAM or part solderedsingle SODIMM Recently soldered