NHK (日本放送協会, Nippon Hōsō Kyōkai, Official English name: Japan Broadcasting Corporation) is Japan's national public broadcasting organization. NHK, which has always identified itself to its audiences by the English pronunciation of its initials, is a publicly owned corporation funded by viewers' payments of a television license fee.
NHK operates two terrestrial television services (NHK General TV and NHK Educational TV), three satellite television services (NHK BS-1, NHK BS-2, and NHK Hi-Vision, a High-definition television service), and three radio networks (NHK Radio 1, NHK Radio 2, and NHK FM).
NHK also provides an international broadcasting service, known as NHK World. NHK World is composed of NHK World TV, NHK World Premium, and the shortwave radio service NHK World Radio Japan. World Radio Japan also makes some of its programs available on the internet.
Source: Wikipedia, "NHK," available under the CC-BY-SA License.