fundamental change in power or organizational structures that takes place in a relatively short period of time

A revolution is a very sharp change made to something. The word comes from Latin and is related to the word revolutio (which means turnaround).

Revolutions are usually political in their nature. Some people feel unhappy with their lives, and others are not happy with whole systems. They might join together, share their ideas, and make something change. Often, revolutions include fighting and civil unrest, but there are also revolutions that happen without fighting.

The Soviet Union was started by the Russian Revolution, which killed millions, and the couutry later fell apart in another revolution without much fighting. Howerver, in the French Revolution (1789), there was much bloodshed., which included the Reign of Terror.

Other events often called "revolutions" include:

The opposing idea in politics is called gradualism.