The IndyCar Series is currently famous as the NTT IndyCar Series.
It is the premier level of open-wheel racing in North America.
Its parent company began in 1996 as the Indy Racing League (IRL).
IRL is the creation of Indianapolis Motor Speedway.
In addition, it is a competitor to CART.
The IndyCar Series merged with the Champ Car World Series (formerly CART) in 2018.
In sum, the series is self-sanctioned by IndyCar.