HBO (Home Box Office) is an American premium cable and satellite television network that is owned by Home Box Office Inc., an operating subsidiary of Time Warner. HBO's programming consists primarily of theatrically released motion pictures and original television series, along with made-for-cable movies and documentaries, boxing matches and occasional stand-up comedy and concert specials. HBO is the oldest and longest continuously operating pay television service (basic or premium) in the United States, having been in operation since November 8, 1972.
As of August 2013, HBO is available to approximately 32,445,000 pay television households (28.41% of households with television) in the United States.
-- Quote from wikipedia.org