Whether your motherboard lacked ports out of the box or you plugged them all up with accessories and peripherals, a PCIe USB expansion card is one way to get more ports (or a Thunderbolt PCIe card ...
This showed that the Raspberry Pi would happily talk with a VL805-based USB 3.0 PCIe expansion card, as well as a Realtek RTL8111-based Ethernet card, but not a number of other PCIe cards.
PCI Express (PCIe) has been around since 2003, and in that time it has managed to become the primary data interconnect for not only expansion cards ... HDMI and USB, as well as on PCBs, where ...
USB and Ethernet ports are sockets on the outside of the computer case that a cable plugs into. In contrast, PCI Express (PCIe) slots are sockets on the motherboard that expansion cards are ...