<P> Since its launch in 1981, the brand "MTV" has expanded to include many additional properties beyond the original MTV channel, including a variety of sister channels in the US, dozens of affiliated channels around the world, and an Internet presence through MTV.com and related websites . </P> <P> MTV operates a group of channels under MTV Networks--a name that continues to be used for the individual units of the now Viacom Media Networks, a division of corporate parent Viacom . In 1985, MTV saw the introduction of its first true sister channel, VH1, which was originally an acronym for "Video Hits One" and was designed to play adult contemporary music videos . Today, VH1 is aimed at celebrity and popular culture programming which include many reality shows . Another sister channel, CMT, targets the country music and southern culture market . </P> <P> The advent of satellite television and digital cable brought MTV greater channel diversity, including its current sister channels MTV2 and MTV Tr3́s (now Tr3́s), which initially played music videos exclusively but now focus on other programming . MTV also broadcasts MTVU, a college - oriented channel on campus at various universities . </P> <P> In the 2000s, MTV launched MTV HD, a 1080i high definition simulcast feed of MTV . Until Viacom's main master control was upgraded in 2013, only the network's original series after 2010 (with some pre-2010 content) are broadcast in high definition, while music videos, despite being among the first television works to convert to high definition presentation in the early 2000s, were presented in 4: 3 standard definition, forcing them into a windowboxing type of presentation; since that time all music videos are presented in HD, and are framed to their on director's preference . Jersey Shore, despite being shot with widescreen HD cameras, was also presented with SD windowboxing (though the 2018 Family Vacation revival is in full HD). The vast majority of providers carry MTV HD . </P>

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