A UPS (Uninterruptible Power Supply) is an electrical device that provides emergency power to a load when the main power source fails. Its primary function is to protect critical equipment—such as computers, data servers, and medical devices—from power outages, voltage sags, surges, and other electrical irregularities. A UPS works by storing energy in a battery and, upon detecting a power failure, instantly and automatically switches the load to the battery supply. This allows equipment to continue running for a short period, giving users enough time to save data and perform an orderly shutdown. A UPS is a crucial component for ensuring business continuity and data integrity in the event of an unexpected power disruption.