Over time, expansion slot machine architecture has changed dramatically to accommodate both user demands and technological advancements. Industry Standard Architecture (ISA) slots, which were first ulightning slotssed by older systems, have mostly been phased out in favor of faster and more effective interfaces. The three most popular expansion slot types available today are AGP (Accelerated Graphics Port), PCI Express (PCIe), and PCI (Peripheral Component Interconnect). Every one of these slots has a distinct function and provides different performance, bandwidth, and expansion card compatibility levels.