An Uninterruptible Power Supply (UPS) is a crucial electrical device that provides backup power to connected equipment when the main power source fails. It's different from a traditional generator because it provides near-instantaneous protection by drawing on a stored energy source, typically a battery. This immediate power transfer is essential for protecting sensitive hardware like computers, servers, and medical equipment from data loss and damage caused by sudden outages, voltage sags, or surges.UPS systems are available in different topologies to suit various needs. The three main types are:Standby (or offline) UPS, which switches to battery power with a slight delay when an issue is detected. Line-interactive UPS, which provides better protection by regulating voltage fluctuations without needing to switch to battery power, andOnline (or double-conversion) UPS, which offers the highest level of protection by continuously converting power, ensuring a seamless and clean power supply with zero transfer time.The choice of UPS depends on the criticality of the equipment it protects.