Composite is a structural design pattern that lets you compose objects into tree structures and then work with these structures as if they were individual objects.

Bridge is a structural design pattern that lets you split a large class or a set of closely related classes into two separate hierarchies—abstraction and implementation—which can be developed independently of each other.

Adapter is a structural design pattern that allows objects with incompatible interfaces to collaborate.

Structural patterns explain how to assemble objects and classes into larger structures while keeping these structures flexible and efficient.

Proxy is a structural design pattern that lets you provide a substitute or placeholder for another object. A proxy controls access to the original object, allowing you to perform something either before or after the request gets through to the original object.