A power distribution unit (PDU) is a device for controlling electrical power in a data center. The most basic PDUs are large power strips without surge protection. They are designed to provide standard electrical outlets for data center equipment and have no monitoring or remote access capabilities. More advanced PDUs provide real-time monitoring and remote access capabilities.

PDUs manage and distribute electricity and are normally installed directly onto a rack. The power source could be alternating current (AC) or direct current (DC). It can come from an uninterruptible power supply, a utility power supplier, or a generator or other secondary power source. PDUs are also designed for power requirements that are typically much larger than home or office power strips and surge protectors.