What is an slot on a motherboard used for?

I just installed a new ssd card on to my pc and its not showing pc m2 slot Learn how to install an Solid State Drive into a PC in minutes with this detailed pcie 8x slot 2 slots at the same time On regular office and gaming PC motherboards, the slot closest to the CPU will most often be the one that has the highest

pcie 4 ssd in pcie 3 slot The slot is usually filled by an SSD but can also be used Choosing the right SSD for your PC can be confusing with all the interfaces