No Direct Communication Between Users:?

Short answer: Users don’t need to know the identities of other users or how to reach them. The mediator centralizes communication, and the users only rely on the mediator to send and receive messages. Benefits of the Mediator Pattern:

Real-world example (ShopNest)

Use a GoF pattern in ShopNest only when it removes duplication or makes a change safer—explain the problem it solves in the interview.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.