Assume you know any programming language. Next level is to know OOPs. Suppose you know all the concepts of OOPs namely class and objects, inheritance, polymorphism. You cannot work with any software project. Why? The simple reason is now a day projects are made using some 3rd party library or framework. All these make the use of design patterns. Also some time you have to make the use of some design pattern to hide the complexity of these predefined code. Design Patterns are typical solutions to commonly occurring problems in software design. They are blueprints that you can customize to solve a particular problem in any software project design. There are 23 design patterns that are divided in three categories namely Creational, Structural and Behavioural. Example of Creational Design Patterns are the Factory Method, Abstract Factory, Builder, Singleton, Object Pool, and Prototype. Structural Design Patterns are Adapter, Bridge, Composite, Decorator, Facade, Flyweight, Private Class Data, and Proxy. Behavioral Design Patterns are Chain of responsibility, Command, Interpreter, Iterator, Mediator, Memento, Null Object, Observer, State, Strategy, Template method, Visitor.This course provide you the information of some of the useful design patterns namely singleton, factory, prototype, adapter and facade. Some more factory pattern will be added later on depending upon your feedback