Internal and external power supplies are two different types of power sources used in electronic devices. Internal power supplies are designed to be housed within the electronic device itself, such as a computer, television, or gaming console. They are typically installed during the manufacturing process and directly connected to the device's internal circuitry. External power supplies, also known as off-board power supplies or wall adapters, are separate units that provide power to the electronic device. They are connected to the device via a cable and plug into a power outlet. The choice between internal and external power supplies depends on various factors such as the device's design, intended use, portability requirements, and power consumption. Internal power supplies offer a more integrated and compact solution, while external power supplies provide flexibility and portability.