Political colours are colours used to represent a political party, either officially or unofficially. Parties in different countries with similar ideologies tend to use similar colours. For example, the colour red symbolises left-wing ideologies (c.f. Red Flag, Red Army, Red Scare). However, the political associations of a given colour vary from country to country; for example, red is also the colour associated with the conservative Republican Party in the United States since the 21st century.