UPS - Uninterruptible Power Supply

UPS stands for Uninterruptible Power Supply. 
It helps the computer system keep operating by supplying the power to the system even when there is failure of electricity and protects the system from sudden shutting down and helps to save the data and the system properly.

Whenever working on the computer and if electric power suddenly goes off, then there will be no time for saving the important work. So at such condition, UPS helps to save the work.