What is precrime? Describe the precogs and their role.

Agatha is one of three Precogs. With the other two Precogs, she projects visions of crimes that have yet to happen to the PreCrime Division. Agatha is the most talented of the three Precogs, as Iris Hineman tells John when he visits her greenhouse. Her mother is Anne Lively, a mysterious murder case that John investigates. Precrimes are crimes that the precogs foretell.