But it's more than about fast cars. The event helps kids in a big, big way.
Children used to spending too much of their time at Michigan Children's Hospital - but on Firday they had a front row seat at the grand prix.
Friday's trackside VIP treatment was put on by Racing for Kids. An organization that has been connecting sick children with races and drivers since 1989.
"The one thing the drivers do is they take their minds off some serious treatments," said Pat Wright, executive director, Racing for Kids. "They give them hope and put smiles on their faces."
The highlight of the day was when the kids got to meet Indy driver Gabby Chavez.
"I appreciate moments like this where I can spend time with kids," he said.
If you would like to get involved with Racing for Kids, go to: http://www.racingforkids.org/