Question: Big Brother is what?

Context articles: Celebrity Big Brother 18 (UK)
Big Brother Slavnih
Big Brother 18 (UK)
Big Brother 16 (UK)
Chris Nieratko
Big Brother (magazine)
Big Brother 10 (UK)
Big Brother (Thai TV series)
Celebrity Big Brother 13 (UK)
Ultimate Big Brother

Celebrity Big Brother 18 was the eighteenth series of the British reality television series "Celebrity Big Brother", hosted by Emma Willis and narrated by Marcus Bentley.
 The series launched on 28 July 2016, just two days after the conclusion of "Big Brother 17" on Channel 5 in the United Kingdom and TV3 in Ireland.
 The series ended on 26 August 2016, making it the longest summer series to date and the third-longest series of "Celebrity Big Brother" in its history, behind series 15 and 17, respectively.
 Rylan Clark-Neal continues to present the spin-off show "Celebrity Big Brother's Bit on the Side".
 It is the eleventh celebrity series and the seventeenth series of "Big Brother" overall to air on Channel 5.
Big Brother Slavnih ( "Big Brother Fame") was the first and, as of 2016, only season of Celebrity Big Brother in Slovenia.
 It began on October 3, 2010, two-and-a-half-years after the previous Slovenian edition, "Big Brother 2".
 Nina Osenar, who had hosted the previous seasons of "Big Brother" in Slovenia, returned to host "Big Brother Slavnih".
Big Brother 2017, also known as Big Brother 18 and The United Kingdom of Big Brother, was the eighteenth series of the British reality television series "Big Brother", hosted by Emma Willis and narrated by Marcus Bentley.
 The series launched on 5 June 2017 on Channel 5, and ended after 54 days on 28 July 2017.
 Rylan Clark-Neal continues to present the spin-off show "Big Brother's Bit on the Side".
 The series, along with its spin-off, continues to air on 3e in Ireland, as part of a three-year deal between the Irish broadcaster and Endemol Shine Group.
 It is the seventh regular series and the nineteenth series of "Big Brother" in total to air on Channel 5 to date.
Big Brother 2015, also known as Big Brother 16 and Big Brother: Timebomb, was the sixteenth series of the British reality television series "Big Brother", hosted by Emma Willis and narrated by Marcus Bentley.
 The series launched on Channel 5 in the United Kingdom and TV3 in the Republic of Ireland on 12 May 2015 and ended on 16 July 2015, a week earlier than planned.
 This was the earliest launch of a "Big Brother" series since the show's inception in 2000.
 It is the fifth regular series and the thirteenth series of "Big Brother" overall to air on Channel 5, and is the first regular series to air in May since "Big Brother 8" in 2007.
 It is also the first series to air in Ireland since its move to Channel 5 in 2011.
 On 2 February 2015, it was revealed that Willis had stepped down as a host on the show's spin-off series "Big Brother's Bit on the Side", though Rylan Clark will continue.
Chris Nieratko (born February 19, 1976) is an American humorist and author.
 Nieratko is a past editor of "Big Brother" magazine, and currently reviews pornographic films for Vice magazine, as well as being the author of the related "Skinema" book.
 He also appeared on MTV's Jackass.
Big Brother was a skateboarding magazine founded by Steve Rocco in 1992, which was notable for ushering in street skating and the sub-culture of skateboarding.
 "Big Brother" ceased publication in 2004.
Big Brother 2009, also known as Big Brother 10, was the tenth series of the British reality television series "Big Brother".
 It began on 4 June 2009 and was aired on Channel 4 and E4 for 93 days, concluding on 4 September 2009 when Sophie "Dogface" Reade was crowned the winner with 74.4% of the viewer's vote.
 The format of the programme remained largely unchanged from previous series; a group of people, referred to as housemates, are enclosed in the Big Brother House under the surveillance of cameras and microphones.
 Each week, the viewers decide which of a selection of housemates is evicted and, in the final week, one housemate is voted as the winner.
 The daily highlights programme was narrated by Marcus Bentley, Davina McCall fronted the launch programme, evictions, special episodes, the final and "Big Brother's Big Mouth" and George Lamb presented "Big Brother's Little Brother".
Big Brother is the Thai version of the "Big Brother" reality television show based on the Dutch television series of the same name originally created by John de Mol in 1997.
 It is shown on iTV and TrueVisions channel 20.
The show follows a group of House Guests living together 24 hours a day in the "Big Brother" house, isolated from the outside world but under constant surveillance with no privacy for three months.In 2 seasons of the show, 27 different people have entered the Big Brother house so far.
 Since its debut in 2005, Big Brother Thailand has run continuously with at least one season of the show airing each year, Big Brother was renewed for a 2nd season.
Celebrity Big Brother 13 was the thirteenth series of the British reality television series "Celebrity Big Brother".
 The series launched on 3 January 2014 on Channel 5 and was originally meant to end after 22 days on 24 January 2014.
 However, it was extended due to ratings success and instead ended after 27 days on 29 January 2014, making it the longest Channel 5 series of the show (at the time, since beaten by "Celebrity Big Brother 15") and the joint-longest series, along with "Celebrity Big Brother 7" in 2010.
 It is the sixth celebrity series and the ninth series of "Big Brother" overall to air on the channel.
 Emma Willis returned to host the series, whilst Rylan Clark returned to present spin-off show "Big Brother's Bit on the Side" along with Willis.
Ultimate Big Brother was the final series of the UK reality television programme "Big Brother" to air on Channel 4.
 The series was broadcast for 18 days, from 24 August 2010 to 10 September 2010 and was produced by Remarkable Pictures, a division of Endemol.
 It featured memorable housemates from previous series of "Big Brother", and a smaller section of housemates from "Celebrity Big Brother".
 A 24-hour live streaming service was also available via the "Big Brother" website as a fee-based service.
 The series ended with Brian Dowling winning the title of the "Ultimate Housemate" and the words "Big Brother will get back to you".