1. What is a Design Pattern. A design pattern is a proven, reusable solution to a commonly occurring software design problem. It represents best practices developed by experienced software developers to solve recurring problems in object‑oriented design. 2. What is Decorator Design Pattern . Decorator Pattern allows behavior to be added to an object dynamically without modifying its existing code. Decorator Design Pattern  Implementation of Decorator: In decorator methods we provide additional behaviour on top that provided by concrete component instance  3.Why Decorator Pattern is Needed 1. Avoids Too Many Subclasses Instead of creating multiple subclasses, decorators allow you to combine features dynamically. Example: 2. Adds Features at Runtime You can wrap an object with additional…