A modified sine wave is a type of electrical waveform commonly used in power inverters. Unlike a pure sine wave, which has a smooth and continuous oscillation, a modified sine wave has a stepped shape. This means it approximates a sine wave but has flat tops and abrupt transitions, making it simpler and cheaper to produce. Modified sine waves are suitable for many devices, but they may not work well with sensitive electronics like computers or medical equipment. These devices often require a pure sine wave for optimal performance. However, modified sine waves are generally adequate for less sensitive appliances, such as lights and fans.