A Republic is a form or system of government whereby the citizens retain sovereign or supreme power as opposed to a monarch or ruling class. In a Republic, the government is made up of citizens, who are selected and elected by the citizens themselves to represent them, and to make decisions on their behalf for a period of time.
Note: The United States of America is an example of a Republican (not to be confused with the Republican Party) system of government. The U.S.A. is a unique form of a Republic, sometimes referred to as Americanism, and is known for its Declaration of Independence, U.S. Constitution, Bill of Rights, limited government, dominant state governments, use of Limited Capitalism, and the Rule of Law.
Note: The capitalization of the "People" in the U.S. Constitution to indicate that the People hold sovereign power.