The story
The company was originally established as Companhia Brasileira de Meios de Pagamento in 1995 as a joint-venture between Visa International, Bradesco, Banco do Brasil, Banco Santander Brasil), and the now defunct Banco Nacional. Its purpose was to create a common infrastructure to be used by all banks issuing Visa cards, instead of each bank having a separate technological solution to process credit card transactions.
On July 1, 2010, VisaNet was renamed Cielo. Following updated regulation by the Brazilian government, it was no longer the only processor of Visa cards in Brasil and began processing Mastercard, Diners Club and other cards.
From Wikipedia’s article on Cielo S.A., shared under CC BY-SA 4.0.6