Meteosat Third Generation (MTG) is EUMETSAT’s next generation of geostationary satellites, following on from earlier successful missions. This next generation, following on from Meteosat Second Generation, will provide an evolution of the imaging service, including a new Lightning Imager, on MTG-I, and a state-of-the-art atmospheric sounding service providing measurements in the infrared and ultraviolet spectrum. The sounding satellites, MTG-S, will also carry the Sentinel-4 instrument.