An uninterruptible power supply (UPS) is a device that provides backup power to electronic equipment during a power outage. It ensures that devices like computers and servers continue to operate, preventing data loss and hardware damage. A UPS typically contains a battery that kicks in when the main power source fails. In addition to backup power, a UPS also offers surge protection, safeguarding equipment from voltage spikes. This is particularly important for sensitive electronics, as it helps maintain their performance and longevity. UPS systems come in various sizes and capacities, suitable for home use or larger commercial applications.