A power supply is a device that provides electrical energy to power electronic devices. It converts the electrical energy from a source, such as a wall outlet or battery, into a usable form for the device. Power supplies can be found in various forms, including AC-DC converters and DC-DC converters, depending on the requirements of the device they serve. Power supplies are essential components in many electronic systems, including computers, televisions, and industrial equipment. They ensure that devices receive the correct voltage and current needed for optimal performance. Additionally, power supplies often include safety features to protect against overloads and short circuits, enhancing the reliability of the connected devices.