Same as for any other flag - to serve as a national symbol.
Because of Christianity.
Norway
Red, blue and white- it looks like London's flag! :)
Saudi
Blue, white and red.
The cross symbolizes Christianity.
Norway
when 1905, why because it be a sovereign nation
Red, white and blue
2 All purpose flags are authorized. -The All-Weather (Storm) Flag -"All-Purpose" Flag
it's obviously Iceland.
Because Fredrik Meltzer drew it like that in 1821. The flag includes elements from both the Danish and the Swedish flags.