(written from a Production point of view)
Launched on 29 October 2007, Hulu is an American online streaming service that offers a selection of TV shows, movies, and other media. Subscribers can access episodes in HD (when available) from a number of US networks including NBC, Fox, and ABC.
All of The Original Series, Star Trek: The Next Generation, Star Trek: Deep Space Nine, Star Trek: Voyager, and Star Trek: Enterprise are currently available via Hulu. The Original Series and the first two seasons of The Next Generation are available in remastered high definition.
Having already acquired a major stake as early as 2009,  The Disney Company became the majority owner of Hulu in 2018 when it acquired one of the other owners, 21st Century Fox, in full.  Gearing up to launch Disney+, a major streaming service of their own, in November 2019, Disney announced that Hulu will continue to exist as a separate brand for the time being, albeit bundled with, and subordinated under, the new overall streaming service.  Industry analysts accurately foresaw that the launch of Disney+ would precipitate a "Streaming War" between the services with dire repercussions for the already established services, particularly Netflix, which indeed lost a considerable part of its library to Disney+. 
Around the turn of 2020/2021 Hulu became compensated for loosing out on Discovery, when Disney moved its far more succesful franchise competitor The Orville, a Fox property, over to Hulu as a Hulu-exclusive.