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What is a UPS?

  1. Unified Power Service

  2. Uninterruptible Power Supply

  3. Universal Power Source

  4. Ubiquitous Power Socket

The correct answer is: Uninterruptible Power Supply

A UPS stands for Uninterruptible Power Supply and is a device that provides backup power to connected devices during a power outage or disruption. Option A, Unified Power Service, is incorrect as there is no such thing as a unified power service. Option C, Universal Power Source, is incorrect as a UPS is not meant to be a universal power source for all devices. Option D, Ubiquitous Power Socket, is incorrect as a UPS is not just a simple socket, but a device with specific functions and features.