Lets you reduce chaotic dependencies between objects. The pattern restricts direct communications between the objects and forces them to collaborate only via a mediator object

Class Diagram

https://refactoring.guru/design-patterns/mediator

Real World Example

https://refactoring.guru/design-patterns/mediator

Use Cases

• Chat Rooms and communication in general (when we need to isolate objects from each other)
• UI elements

PROS

• You can extract the communications between various components into a single place, making it easier to comprehend and maintain.
• You can introduce new mediators without having to change the actual components.
• You can reduce coupling between various components.
• You can reuse individual components more easily.

CONS

• Over time a mediator can evolve into a God Object.