An AC DC power adapter, also known as a power supply unit or PSU, has several advantages. Firstly, it converts a high voltage AC power supply to a low voltage DC power supply, making it safer for some electronic devices to use. Secondly, it provides a constant and stable source of power, ensuring that the electronic device can work efficiently without interruption. Additionally, AC DC power adapters are designed to be lightweight and compact, making them easy to transport and use in different locations. Finally, they're designed with safety features, such as over-voltage protection and short-circuit protection, to protect electronic devices from damage due to power surges or overloading.