An Uninterruptible Power Supply (UPS) is an electrical device that provides emergency backup power to a connected load when the primary power source fails. It differs from a traditional standby generator in that it provides near-instantaneous protection from power interruptions, allowing equipment to continue running without a break. The main purpose of a UPS is to protect sensitive electronic equipment, such as computers, data centers, and medical devices, from power problems like blackouts, brownouts, and surges. By providing a stable and reliable power source, a UPS prevents data loss, hardware damage, and costly downtime.