What is an slot on a motherboard used for?

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If a system has an PCIe slot, an SATA SSD with identical keying will fit in the slot but will not work, and vice versa There are some systems that

2 is SSD data storage, basically functioning as an alternative to the existing ” storage drives that are mounted in a separate bay and then is a new form of connectivity that allows a SSD to connect directly to the PCI-E bus allowing for theoretical speeds as high as 2GBs

slot arena If a system has an PCIe slot, an SATA SSD with identical keying will fit in the slot but will not work, and vice versa There are some systems that I Guess what I am after is to know if an SSD can go in this slot Well since the does have 2 PCIe lanes it is possible to put there a