This module introduces the VIIRS imager that was launched on the Suomi NPP (National Polar-orbiting Partnership) satellite in October 2011 and will fly on future U.S. JPSS weather satellites. The VIIRS imager has many advanced features that improve both spectral and spatial resolution. Together with modernized data communication and processing systems, VIIRS will provide consistent, high quality, and high resolution data to users. The module covers the enhanced capabilities of VIIRS by examining the systems that contributed to its development. Special attention is paid to the Day/Night Visible channel as VIIRS is the first instrument on a civilian satellite to image atmospheric and terrestrial features with and without moonlight.