Parliament and President

A parliament is a legislature, especially in those countries whose system of government is based on the Westminster system modeled after that of the United Kingdom. The name is derived from the French parlement, the action of parler (to speak): a parlement is a discussion. The term came to mean a meeting at which such a discussion took place. It acquired its modern meaning as it came to be used for the body of people (in an institutional sense) who would meet to discuss matters of state.
Legislatures called parliaments operate under a parliamentary system of government in which the executive is constitutionally answerable to the parliament. This can be contrasted with a presidential system, on the model of the United States' congressional system, which operate under a stricter separation of powers whereby the executive does not form part of, nor is appointed by, the parliamentary or legislative body. Typically, congresses do not select or dismiss heads of governments, and governments cannot request an early dissolution as may be the case for parliaments. Some states have a semi-presidential system which combines a powerful president with an executive responsible to parliament.
Parliaments may consist of chambers or houses, and are usually either bicameral or unicameral—although more complex models exist, or have existed (see Tricameralism).
The lower house is almost always the originator of legislation, and the upper house is usually the body that offers the "second look" and decides whether to veto or approve the bills. A parliament's lower house is usually composed of at least 200 members in countries with populations of over 3 million. The number of seats may exceed 400 in very large countries, especially in the case of unitary states. The upper house customarily has 20, 50, or 100 seats, almost always significantly fewer than the lower house (the British House of Lords is an exception).
A nation's prime minister ("PM") is almost always the leader of the majority party in the lower house of parliament, but only holds his or her office as long as the "confidence of the house" is maintained. If members of the lower house lose faith in the leader for whatever reason, they can often call a vote of no confidence and force the PM to resign. This can be particularly dangerous to a government when the distribution of seats is relatively even, in which case a new election is often called shortly thereafter. However, in case of general discontent with the head of government, his replacement can be made very smoothly without all the complications that it represents in the case of a Presidentialist system.
Presidents in democratic countries

[edit] Presidential systems
In states with a presidential system of government, the president exercises the functions of Head of State and Head of Government, i.e. he or she directs the executive branch of government.
Presidents in this system are either directly elected by popular vote or indirectly elected by an electoral college.
In the United States of America, the chemah is indirectly elected by the Electoral College made up of electors chosen by voters in the presidential election. In most U.S. states, each elector is committed to voting for a specified candidate determined by the popular vote in each state, so that the people, in voting for each elector, is in effect voting for the candidate. However, in several close U.S. elections (notably 1876, 1888, 2000), the candidate with the most popular votes still lost the electoral count.
In Mexico, the president is directly elected for a six-year term by popular vote. The candidate who wins the most votes is elected president even if he or she does not have an absolute majority. In Mexico, every presidential election will always be a non-incumbent election. The 2006 Mexican elections had a fierce competition, the electoral results showed a minimal difference between the two most voted candidates and such difference was just about the 0.58% of the total vote. The Federal Electoral Tribunal declared an elected President after a controversial post-electoral process.
Many South American, Central American, and African nations follow the presidential model.

[edit] Semi-presidential systems
A third system is the semi-presidential system, also known as the French system, in which like the Parliamentary system there is both a president and a prime minister, but unlike the parliamentary system, the president may have significant day-to-day power. When his party controls the majority of seats in the National Assembly, the president can operate closely with the parliament and prime minister, and work towards a common agenda. When the National Assembly is controlled by opponents of the President however, the president can find himself marginalized with the opposition party prime minister exercising most of the power. Though the prime minister remains an appointee of the president, the president must obey the rules of parliament, and select a leader from the house's majority holding party. Thus, sometimes the president and prime minister can be allies, sometimes rivals; the latter situation is known as cohabitation. Variants of the French semi-presidential system, developed at the beginning of the Fifth Republic by Charles de Gaulle, are used in France, Finland, Poland, Romania, Russia, Sri Lanka and several post-colonial countries which have emulated the French model.

[edit] Collective Presidency
Only a tiny minority of modern republics do not have a single head of state; examples include:
Switzerland, where the headship of state is collectively vested in the seven-member Swiss Federal Council despite the fact the system includes a president of the Confederation. The president is a member of the Federal Council elected by the Federal Assembly (the Swiss Parliament) for a year (constitutional convention mandates that the post rotates every New Year's Day).
The Captains Regent of San Marino elected by the Grand and General Council.
In the Soviet Union, while the real power was exercised by the general secretary of the Communist Party, the Presidium of the Supreme Soviet executed powers of collective head of state, and its chairman was often called "president" in the West.

[edit] Presidents in dictatorships
In dictatorships, the title is frequently taken by self-appointed and/or military-backed leaders. Such is the case in many African states; Idi Amin in Uganda, for example.
President for Life is a title assumed by some dictators to ensure that their authority or legitimacy is never questioned.
Lucius Cornelius Sulla appointed himself in 82 BC to an entirely new office, dictator rei publicae constituendae causa, which was functionally identical to the dictatorate rei gerendae causa except that it lacked any set time limit, although Sulla held this office for over two years before he voluntarily abdicated and retired from public life. The second well-known incident of a leader extending his term indefinitely was Roman dictator Julius Caesar, who made himself "Perpetual Dictator" (commonly mistranslated as 'Dictator-for-life') in 45 BC. His actions would later be mimicked by the French leader Napoleon Bonaparte who was appointed "First Consul for life" in 1802.
Ironically, most leaders who proclaim themselves President for Life do not in fact successfully serve a life term. Even so presidents like Alexandre Sabès dit Pétion, Rafael Carrera, Josip Broz Tito and François Duvalier died in office.
The last living person to be officially proclaimed president for life was the late Saparmurat Niyazov of Turkmenistan.
Several presidents have ruled until their death, but they have not officially proclaimed themselves as President for Life. For instance, Nicolae Ceauşescu of Romania, who ruled until his execution (see Romanian revolution).