Tie-in (noun)

1. A connection or relationship between two things or events.
2. A product or service that is marketed in association with another, typically a successful one.

Origin:

Late 19th century: from tie in, denoting a binding together.

Examples:

1. The book has a tie-in with the movie adaptation.
2. The video game has a tie-in with the comic book series.
3. The TV show has a tie-in with a toy line.
4. The advertisement campaign has a tie-in with the company's new product.
5. The event has a tie-in with the charity organization.