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The Brazilian Federation is the "indissoluble union" of three distinct political entities: the States, the Municipalities and the Federal District.[13] The Union, the states and the Federal District, and the municipalities, are the "spheres of government." The Federation is set on five fundamental principles:[13] sovereignty, citizenship, dignity of human beings, the social values of labour and freedom of enterprise, and political pluralism. The classic tripartite branches of government (executive, legislative, and judicial under a checks and balances system), is formally established by the Constitution.[13] The executive and legislative are organized independently in all three spheres of government, while the judiciary is organized only at the federal and state/Federal District spheres.

All members of the executive and legislative branches are directly elected.[145][146][147] Judges and other judicial officials are appointed after passing entry exams.[145] For most of its democratic history, Brazil has had a multi-party system, proportional representation. Voting is compulsory for the literate between 18 and 70 years old and optional for illiterates and those between 16 and 18 or beyond 70.[13]

Together with several smaller parties, four political parties stand out: Workers' Party (PT), Brazilian Social Democracy Party (PSDB), Brazilian Democratic Movement Party(PMDB), and Democrats (DEM). Fifteen political parties are represented in Congress. It is common for politicians to switch parties, and thus the proportion of congressional seats held by particular parties changes regularly.[148] Almost all governmental and administrative functions are exercised by authorities and agencies affiliated to the Executive.

The form of government is that of a democratic republic, with a presidential system.[13] The president is both head of state and head of government of the Union and is elected for a four-year term,[13] with the possibility of re-election for a second...