Politics in Portugal takes place in a framework of a semi-presidential representative democratic republic, whereby the Prime Minister of Portugal is the head of government. Portugal has a multi-party system. The President of Portugal is the executive head of state and has several significant political powers, which he exercises often. Executive power is exercised by the President and the Council of Ministers. Legislative power is vested in both the government and the Assembly of the Republic. The judiciary is independent of the executive and the legislature.
Since 1975, the party system has been dominated by the social democratic Socialist Party and the liberal-conservative Social Democratic Party.
The national and regional governments are dominated by two political parties, Socialist Party (PS), a social democratic party that resembles British Labour or the German SPD, and the Social Democratic Party (PSD), a liberal-conservative party and member of the European Parliament's European People's Party group, which have similar basic policies in some respects: both are pro-Europe and support the market economy. Other parties with seats in the parliament are the Portuguese Communist Party, the CDS – People's Party, the Left Bloc and the Ecologist Party "The Greens". The Communists and the Greens are in coalition as the Unitary Democratic Coalition.