What are PCIe x1 Slots Used For?

What is the meaning of the blue PCIe slot on the Dell T7910 pcie slot meaning Every motherboard has a varying amount of PCIe slots that are used to connect PCIe peripherals like GPUs, SSDs, capture cards, etc PCIe was introduced in pcie slot size PCI Express lanes are paths between the motherboard chipset and PCIe slots or other devices that are part of the motherboard, such as the

pcie x16 expansion 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