Decoupling of Sender and Receiver:?

Short answer: The sender (the TextEditor) is decoupled from the receiver (Document). The TextEditor only knows how to invoke commands but does not need to understand the details of the operations (e.g., how the text is added or removed).

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.