Big Brother Brasil is the Brazilian version of the Big Brother reality franchised television show based on the original Dutch television series of the same name, that was created in 1997 by John de Mol. It is the second one with more finished seasons (only after the American version) and the only one with more than 20 years of uninterrupted annual transmission in the same channel.

The show is based on a group of strangers, known as housemates, living together twenty-four hours a day in the "Big Brother" house, isolated from the outside world (primarily from mass media, such as newspapers, telephones, television and the internet) while having all their steps followed by cameras around-the-clock, with no privacy for three months.

The housemates compete for the chance to win the grand prize by avoiding weekly eviction, until the last housemate remains at the end of the season that can claim the grand prize. The show's current host is journalist Tadeu Schmidt.

TV Globo's website and a Globo-owned pay-per-view channel offer round-the-clock coverage. Sabrina Sato (season 3) used to be one of the hosts of Panico na TV and now hosts her own TV program, Juliana Alves (season 3) and Grazi Massafera (season 5) are soap opera actresses at TV Globo, Íris Stefanelli and Flávia Vianna (season 7) were reporters for many years in a show called TV Fama. The five can be considered the most successful contestants of the show, although none of them have won the show. The only three winners who enjoyed success after the show are Jean Wyllys, who had been following a political career as a federal deputy since winning the fifth season until leaving Brazil in 2019. Thelma Assis , who became a TV presenter for the station, in addition to having contracts with several brands. And Juliette Freire who became an internet phenomenon by reaching 24 million Instagram followers during the show's 21st season. After the show, she devoted herself to building a successful music career.

The twentieth season of the show had the biggest participation in the world of votings in an eviction, reaching over 1.5 billion votes. The previous record, also achieved by Big Brother Brasil in the same season, was 416 million votes. Advertising quotas reached R$78 million, with a total collection of R$530 million.