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External power supplies, often referred to as power adapters or AC adapters, are compact devices that convert AC power from a wall outlet into DC power suitable for electronic devices. They are commonly used to power laptops, routers, external hard drives, monitors, and other peripherals. These supplies vary in output voltage, current capacity, and connector types to accommodate different devices and voltage requirements. External power supplies provide convenient and portable power solutions, enabling flexibility in device usage and reducing the need for internal power conversion within electronic equipment.