Why are there 50 stars on the flag? why are there 13 stripes on it ? what do people often call the american flag?

One star for each state. There is one stripe for each of the first thirsting colonies of the United States. Called "The Stars and Stripes"

ThThe 13 stripes are the first 13 colonies.The colors of the American Flag are blue, red & white.The 50 stars are the 50 states.