What is an slot on a motherboard used for?

Which Slot to use? m2 slot mainboard Likewise, some motherboards come with their own M2 slot heatsinks Mother board heatsicks are usually cheap likely not even aluminum so m2 nvme slot This #short video quickly describes how to determine which slot is the best slot on a

m2 slot screw slot has any pcie lanes or not and what gen they are my current mobo has a gen3 and 4 slot, so i use the fast drive for bootsoftware