https://international.tse.jus.br/en/...cess-in-brazil
Some highlights from the source:
There's one central federal authority (the Electoral Court) that runs the elections, as opposed to 50 different US States.
They use electronic ballot boxes, allowing the elections to be fully computerized.
They don't use voter ID. They are implementing a biometric system for voter identification. Voters' fingerprints are taken at voter registration, are kept on file by the Electoral Court. Currently, 119 million voters are recorded in the system.
Additionally, there's no Electors, the winning candidate is the one with a majority of the vote, and if no one gets a majority, then there's a run-off election between the top two vote getters.