Chess IM vs GM International Master vs Grandmaster

What exactly is the difference between a Chess IM, a GM International Master, and a Grandmaster?

The Chess Advantage in Black and White: by Kaufman, Larry

1000gm

North Oaks teen is youngest American girl to become chess

Start chess in your late teens and become a grandmaster?

How Many Hours Of Chess Study Does It Take To Be A Grandmaster

Can Anyone Be An IM Or GM?

Grandmaster vs. International Master - What's the Difference

Chess Titles - Chess Terms

How a 12-Year-Old From New Jersey Became the Youngest Chess

Chess Titles - Chess Terms