Gundam (Japanese: ガンダムシリーズ, Hepburn: Gandamu Shirīzu, lit. Gundam Series) is a Japanese military fiction media franchise/media mix. Created by Yoshiyuki Tomino and Sunrise (now Bandai Namco Filmworks), the franchise features giant robots, or mecha, with the name “Gundam”. The franchise began on April 7, 1979, with Mobile Suit Gundam, a TV series that defined the “real robot” mecha anime genre by featuring giant robots called mobile suits (including the original titular mecha) in a militaristic setting. The popularity of the series and its merchandise spawned a franchise that includes 50 TV series, films and OVAs as well as manga, novels and video games, along with a whole industry of plastic model kits known as Gunpla which makes up 90 percent of the Japanese character plastic-model market. (Source from Wikipedia)
