Interact is an international organization of service and social clubs for young people of secondary school age that fosters leadership and responsible citizenship and promotes international understanding and peace. The name was created by combining the words "international" and "action." Interact clubs are sponsored by Rotary clubs as a program of Rotary International. Rotary clubs provide guidance and inspiration, but the Interact clubs are self-governing and self-supporting. Clubs take a variety of forms, both single-gender and mixed as well as large and small. The membership base of a club can be drawn from the student body of a single school or from two or more schools within the same community.

Each year, Interact clubs complete at least one community service project and at least one international project that furthers understanding and goodwill. Interactors develop a worldwide network of friendships through exchanges with both local and overseas clubs. Along the way, Interactors develop their leadership skills and initiative while meeting new friends.