An uninterruptible power supply is a device that ensures a continuous supply of electricity to electronic devices, even in the event of a power outage. There are several other words and phrases that can be used interchangeably with uninterruptible power supply. These include backup power supply, power protection system, battery backup, and standby power system. All of these terms refer to the same type of device that provides power continuity to electronic equipment. Uninterruptible power supplies are commonly used in data centers, hospitals, and other critical facilities where an interruption in power could cause significant damage or loss of life.