H2 was a spinoff channel of The History Channel, which was originally known as History International and is owned by A&E Networks.
The channel carries historical and popular science documentaries as well as pseudo-scientific entertainment programs. It also frequently features pseudo-documentaries and unsubstantiated and sensational "investigative" programming that originally aired on History. Unlike History, H2 doesn't air any reality TV programming.
In February 2016, H2 was relaunched as the American version of Viceland.