It depends. Which flag? If it was the US flag then red represents hardiness & valour
The red and white stripes represent the original 13 colonies.
the blood that we shed
blood, the color red on the saskatchewan flag means blood
It used to be orange. But red looked better on the flag ships so they changed it to red.
red and white
China's Flag, or the flag of China, is a mainly red flag with 5 golden stars embellished upon it. The red is to symbolise the Revolution, and the Stars are to represent the leadership change during this time.
Red White and Blue represent freedom.
red: braveryyellow: generosity
Communism, the blood of the revolution.
Seas
it stands for faith
It means "Red People"