EDRS-C is one of the two EDRS (European Data Relay System) satellites. EDRS is the European constellation of two geostationary data relay satellites that will relay information and data between satellites, spacecraft, unmanned aerial vehicles, and ground stations. Broadband communications payload called HYLAS 3 is placed on EDRS-C satellite, and is to complement HYLAS 1 and HYLAS 2 satellites already in orbit.
Ariane 5 ECA+ is a variant of the Ariane 5 heavy-lift vehicle, with a taller ECA-D upper stage.
Arianespace SA is a multinational company founded in 1980 as the world's first commercial launch service provider. It undertakes the production, operation, and marketing of the Ariane programme. Their vehicles launch exclusively from French Guiana in South America.INFO WIKI