There are two important devices viz. UPS and inverter that are used extensively to provide backup supply to the electrical systems. As we know, today electricity has become a necessity because almost all of our day-to-day activities require electricity. Since, all the device such as mobiles, laptops, PCs, washing machines, coolers, ACs, etc. use electricity to work. If the electric supply gets down, it will greatly affect the operation of these devices. Therefore, to smoothly run these devices even after the cut out of electric supply, two electric power systems are designed named Inverter and UPS. Basically, both UPS and inverter are used for the same purpose, i.e. backup power supply, but there are many differences between them. In this article, we will explain the differences between UPS and inverter in detail. For the reader’s reference, we also included a brief description of UPS and inverter which makes it is easy to understand the differences between them.