Final answer:
The Decorator pattern allows for the dynamic addition of functionality to an object by wrapping it in a decorator class.
Step-by-step explanation:
The Decorator pattern is a design pattern that allows for the dynamic addition of functionality to an object by wrapping it in a decorator class. This pattern follows the Open-Closed Principle, which means that classes should be open for extension but closed for modification. The decorator pattern allows new behavior to be added to an object without affecting its original structure or behavior.
For example, let's say you have a class called Shape that represents different shapes, such as a Circle or a Rectangle. You can use the decorator pattern to add additional functionality, such as adding a border or an image, to these shapes. Instead of modifying the Shape class, you can create a decorator class that wraps the shape and adds the desired functionality.