Superstars are very famous and successful people, especially in sports or entertainment.
Superstars are admired and well-known by many people.
Examples:
The singer is a superstar because many people like her songs.
We went to the concert to see the superstar perform.
My friend wants to be a superstar when she grows up.
The soccer player is a superstar because he can kick the ball super far.
In the movie, the superhero is a superstar because he saves the day.
I want to be a superstar and have lots of fans.