What is a PCI device?

A PCI (Peripheral Component Interconnect) device is a hardware component that connects to a computer's motherboard through the PCI bus. This bus allows various peripherals, such as graphics cards, network cards, sound cards, and storage controllers, to communicate with the CPU and memory. PCI devices can be added or removed from a system, enabling users to upgrade or expand their computer's capabilities. The PCI standard has evolved over time, leading to variations like PCI Express (PCIe), which offers faster data transfer rates and improved performance compared to the original PCI.