Final answer:
PCIe was designed to replace older technologies like PCI, PCI-X, and AGP, offering a scalable and high-bandwidth interface for various expansion cards.
Step-by-step explanation:
The Peripheral Component Interconnect Express (PCIe) is a high-speed, serial expansion bus that was designed to replace several older types of expansion slots and buses. The specific technologies that PCIe was designed to replace include PCI, PCI-X, and AGP. PCIe provides a scalable, high-bandwidth, serial interface that can be used for a variety of purposes including graphics cards, network cards, and storage devices.