In computer terminology,UPS stands for uninterruptible power supply.an uninterruptible power supply is an electrical device,usually with an internal battery,that stores electricity to supply energy to connected devices when normal power is interrupted.UPS can prevent data loss and stress on your devices from a hard shutdown.there are several UPS topologies that provide varying degrees of protection.selecting the best fit depends on several factors,including the level of reliability and availability desired,the type of equipment being protected,and application/environment.