Pci (peripheral component interconnect) and pci express (pci-e) are standard interfaces used to connect various internal components to a computer's motherboard.
the cards shown are examples of these expansion cards, which can be installed in a computer's pci or pci-e slots to add new functionalities.
the cards displayed include a pci-e 3.0 card, pci-e pt/serial card, pci-e/lan card, pci-e-usb3.0+type-c, pci-sound card, pci-sata card, pci-pt/serial card, pci-lan card, and pci-usb 2.0 card.
these cards provide different functions such as adding network connectivity, sound capabilities, or additional usb and sata ports.