What exactly does the spec “PCIe x16 slot ” mean?

Every PC, including commercial and industrial computing solutions, comes equipped with at least one PCIe slot, with some computers having

I explain in this video what is PCIe x16 on the motherboard and its uses I also explain what

pcie4 slot A PCI express expansion slot is a newer type of slot that allows for faster data transfer rates than the older peripheral component interconnect

pcie gpu slot A PCIe card will fit into a slot of its size or bigger, but not into a smaller PCIe slot x or later standard, meaning that, a PCI-X card can be installed