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The show features celebrities who have to learn how to dance with the professional dancers they're paired with. It first aired in the US in 2005.

The Israeli edition even featured a same-sex dance pair. Sports anchorwoman Gili Shem Tov, who had recently come out in public, was paired with professional dancer Dorit Milman.

▲Did you know that Hollywood hunk Chris Hemsworth took part in the 2006 Australian edition? Unfortunately, dancing is not one of Thor's many skills, so he was voted out.

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'Big Brother' is one of the biggest go-to shows when it comes to reality TV. It consists in putting a group of random people together in a house without any contact with the outside world.

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Created by a Dutch producing company in 1999, it was then adapted to over 40 countries.

In the UK, the show was so successful it even had its own spin-off: 'Celebrity Big Brother.'

▲Not many people know, but the cooking show was actually first aired in 1990. The format as we know it today was updated and relaunched by the BBC in February 2005.

▲The show has been exported all around the world since then and it is now produced in more than 40 countries.

▲The MasterChef format has even expanded to other offshoots, including 'MasterChef: The Professionals,' 'Celebrity MasterChef' and 'MasterChef Junior.'

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Drag queens take part in different tests as they compete for the big prize. They're judged on their personality, sense of humor and talent, and on their ability to sing, dance and perform.

The show, which aired in 2009, was so successful that it rendered two other spin-offs: 'RuPaul's Drag U' and 'RuPaul's Drag Race: All Stars.'

▲Host RuPaul won an Emmy in 2016 for Best Host of a Reality or Reality-Competition program.

▲'The Apprentice' followed a group of 16 to 18 bussiness people competing for a position at one of Donald Trump's companies. Trump was the show's host and executive producer.

▲The show was exported to several countries and even inspired a video game.

▲The spin-off 'The Apprentice: Martha Stewart' aired in 2005 after she was released from house arrest, but it was cancelled after the first season due to low ratings.

▲A single man gets to hang out with a group of women. By the end of the season, he must choose one to be his wife.

▲The show aired in the US in 2002. Ever since its premiere, it has had three spin-offs: 'The Bachelorette,' 'Bachelor Pad' and 'Bachelor in Paradise.'

▲The show has aired in over 10 countries.

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'Temptation Island' put together a bunch of singletons and a few couples in the same island, where their relationships were put to test.

The show's first season aired in 2001 and it was such a hit that it ended up having international versions in 18 different countries.

▲Participants were isolated in a remote place where they must find food, water and shelter themselves, while avoiding being expelled from the competition every week.

▲The idea for the show was developed in the UK by Charlie Parsons in 1992, and the first version of it aired in Swedish TV in 1997 under the title 'Expedition Robinson.'

▲However, the American version, which first debuted in 2000, became the pioneer in survivor-style reality TV for its huge ratings.

▲Created by Tyra Banks, who was the show's host and executive producer, 'America's Next Top Model' first aired in 2003.

▲The show saw a group of aspiring models living in the same house and facing tough modelling challenges every week.

▲It got so huge that it spanned over to other countries, including Germany, with Heidi Klum as the host.

▲'Supernanny' starred longtime nanny Jo Frost and it aired in the UK in 2004.

▲The show followed Jo as she went around to family houses to help parents educate and discipline their children.

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'Supernanny' was a huge success and ended up being produced in over 20 countries, including Brazil. (Photo: CC BY 2.0)

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Reality TV is still one of the most popular television formats around the world, gluing viewers to their screens as they await for the next dose of drama. Some of these shows became so popular they branched to other countries and lasted for years.

Click here to see the most popular TV shows of all time!