When one object needs to notify many other objects about changes in its state **automatically**, the **Observer Pattern** steps in. ## What is the Observer Pattern? - Defines a....

When you want to create **families of related objects** without specifying their concrete classes, the **Abstract Factory Pattern** is your best friend. --- ## What is the Abstract Factory....

# Factory Pattern Imagine you want to create objects — but you don't want to expose the creation logic to the client and instead ask a factory class to **create objects for you**. That's....

When you want to **add new functionalities** to an object **without modifying its structure**, the **Decorator Pattern** comes to the rescue. The Decorator Pattern lets you dynamically **wrap**....

Sometimes you don't want or can't allow direct access to an object. Maybe it's expensive to create, needs special permissions, or you want to control access in some way. This is where the **Proxy....

Ever found yourself writing similar logic over and over, only to change a few steps each time? That’s exactly what the **Template Pattern** helps you solve. The **Template Pattern** is a....

Ever needed to connect two incompatible interfaces without changing their source code? That’s exactly where the **Adapter Pattern** shines! The Adapter Pattern is a structural design pattern....

Ever needed just one instance of a class in your application? Maybe a logger, a database connection, or a configuration manager? This is where the Singleton Pattern comes in — one of the simplest....