The Solar Ultraviolet Imager (SUVI) is a normal-incidence multilayer-coated telescope that will fly on the NOAA GOES-R series of satellites, providing continuous full-disk coverage of the solar transition region and corona in 6 extreme ultraviolet wavelength bands. The channels are chosen to allow SUVI to provide diagnostics of the thermodynamic state of the solar atmosphere, enabling operational evaluation and prediction of solar phenomena capable of impacting space weather. We describe the design and expected performance of the SUVI instrument, including the spatial resolution, cadence, photometric calibration, and dynamic range; and present an overview of the characteristics of the SUVI data product, including simulated images and movies.