What are the Design PAtterns wou have used with explanation ?

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Design patterns are reusable solutions to common problems in software design. Some commonly used patterns include Singleton, Factory, Observer, and Strategy.

Singleton pattern ensures a class has only one instance and provides a global point of access to it.
Factory pattern creates objects without specifying the exact class of object that will be created.
Observer pattern defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.
Strategy pattern defines a family of algorithms, encapsulates each algorithm, and makes them interchangeable.
Adapter pattern allows incompatible interfaces to work together.
Decorator pattern adds new functionality to an object dynamically without changing its structure.
Facade pattern provides a simplified interface to a complex system.
Template method pattern defines the skeleton of an algorithm in the superclass but lets subclasses override specific steps of the algorithm without changing its structure.

What are the Design PAtterns wou have used with explanation ?

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