How would you describe the appearance of a PCIe bus?

The appearance of a PCIe (Peripheral Component Interconnect Express) bus is best described as a slot on the motherboard. PCIe slots are typically long and rectangular, accommodating PCIe cards such as graphics cards, network cards, and storage controllers that slot into them. These slots provide the necessary interface for data transfer between the motherboard and expansion cards, which utilize the high-speed capabilities of the PCIe bus.

This choice reflects the physical characteristic of the PCIe interface, where the slot serves as the pathway for electronic signals and power, enabling components to communicate effectively with the system. The design and layout of these slots allow for various lengths and configurations, accommodating different types of expansion cards and ensuring that devices can be added or upgraded as needed.