A coup, or coup d’etat, derives from the French verb couper, which means to strike. Etat means "the state." It can be translated to a strike to the state, or a blow to a government. The term coup d’etat, which is often shortened to coup, may refer to a military victory or overthrow of a government. It is usually a total victory that renders the acting government’s military powerless and thus signifies takeover of the government.

When people refer to the coup d’etat, they often call it a military coup. There are four types of military coups according to Samuel Phillips Huntington. Huntington is a political scientist who believes most coups in the 21st century will be those where the people rise up against the government. His four types of coups are:

• The Breakthrough coup,
• The Veto Coup,
• The Guardian Coup,
• The Bloodless Coup.

Technically any coup can be bloodless. Takeover of a government is gained merely by threat and not by using violence. However, most examples of the coup involve the loss of many lives.

The Breakthrough coup occurs when a revolutionary group overthrows the seated government and takes over as the new leaders. A guardian coup occurs when someone seizes top-level power from another, usually stating that doing so is necessary because of mass disorder in the state. A veto coup refers to the army having to put down rebellion and organization by the people of the state. The veto coup tends to be the worst kind because many civilians may be killed in the process.

There are currently many world leaders who owe their power to military coups. These include: Muammar al-Qaddafi, head of Libya, and Pervez Musharraf, the President of Pakistan. Coups are not limited to the Middle East, however. Many African leaders gained power through a coup, and South America has seen numerous coups as well.

Another type of coup is the counting coup. In many Native American tribes, it was considered much greater honor to strike rather than kill an enemy. Some warriors had staffs, which were marked with the number of times they were able to perform a coup in battle, rather than in killing someone. Since coup to the Native American was still a French derived word, the idea of striking rather than killing may have been tied to the concept of “touché,” a touch of the opponent in dueling, rather than a kill.

Completely unrelated to battle is the use of the term coup to mean a victory or benefit in numerous different fields. A fundraising committee who gets a popular singer to sing at a charitable function would consider this a coup. Hosting the Olympics might be considered a coup to a country, just as getting to televise the Olympics is a coup to a television station.

The coup can relate to politics in a non-violent way. For example, in 2006 the Democratic wins in the United States' House and Senate were considered a coup to the Democratic Party. Since this does confer some political power to the Democrats, this could be seen in loosest definition as a bloodless coup.