The flag of the United States consists of thirteen horizontal striped alternating red and white, starting and ending
Usa flag

The Flag of the United States

with red. In the top right, there is a blue canton with fifty white five-pointed stars. This canton alone is the United States Jack.

The thirteen stripes stand for the original Thirteen Colonies. Each of the stars stands for a US State; there are fifty total. The official ratio of the US flag is 19:10, but most commercially-available flags are in other rations, such as 2:3.