A more thorough explanation:

Definition: Revolution is when a group of people overthrow their government, usually resulting in big changes to the way the country is run. It is a successful rebellion against those in power.

Examples:

• The American Revolution was a war fought by the American colonies to gain independence from Great Britain.
• The French Revolution was a period of radical social and political upheaval in France that lasted from 1789 to 1799.
• The Cuban Revolution was a successful armed revolt led by Fidel Castro against the government of Cuba in the late 1950s.

These examples illustrate how revolution involves a group of people rising up against their government to bring about change. In each case, the revolutionaries were successful in overthrowing the existing government and creating a new system of government that better reflected their values and beliefs.