INSAT-3D was a meteorological satellite operated by the Indian Space Research Organisation (ISRO) for improving the imaging system and atmospheric sounder. It was also designed for enhanced meteorological observations, monitoring of land and ocean surfaces, generating vertical profile of the atmosphere in terms of temperature and humidity for weather forecasting and disaster warning. This satellite was launched on 26 July 2013 from Guiana Space Centre in Kourou. This mission was carried out in Ariane-5 VA-214 launch vehicle and has a mass of 2060 Kg.

INSAT-3D was primarily designed for meteorological observations and weather forecasting over the Indian subcontinent and surrounding regions. The satellite aimed to provide accurate weather data for monitoring and predicting weather patterns, including cyclones, rainfall, and temperature variations. INSAT-3D was equipped with advanced meteorological instruments, including the Imager and Sounder, which provided high-resolution images and atmospheric soundings for weather analysis. The satellite's payload also included a Data Relay Transponder (DRT) for relaying meteorological data to ground stations.