Actually, they don't represent anything. Francis Hopkins the man who made the first flag in 1775 for the navy ( he is recognized by Congress) used the Union Jack for his colors and some design features. A Boy Scout manual in the early 1900's gave them meanings and that has stuck.
The colors represent freedom.
The colors on a flag represent different things depending on what country the flag belongs too. Do you have a specific flag that you are asking about?
a flag
red:courage blue:freedom white:peace and mountain snow
the colors of the india flag
colors
The colors on a flag represent what kinds of food a country produces.
Nothing special, they´re derivated from the three traditional slavonic colors: blue, red and white.
It is said that Belgrano (who designed the flag for the first time) was inspired in the robes of the Virgin Marry.
Togo flag colour
the blue is water and the white is wind
the colors on the California flag represents the suffer they went through
The colors and design of the flag do not have an official interpretation. The President has stated the colors represent freedom, the sacrifices of their forefathers, and life.