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 # Java Design Patterns
 
-A repository that contains design patterns in Java.
+Design patterns are **well-proved solution** for solving the specific problem/task.
+
+## Advantages of a Design Pattern
+* They are reusable in multiple projects.
+* They provide the solutions that help to define the system architecture.
+* They capture the software engineering experiences.
+* They provide transparency to the design of an application.
+* They are well-proved and testified solutions since they have been built upon the knowledge and experience of expert software developers.
+* Design patterns don't guarantee an absolute solution to a problem. They provide clarity to the system architecture and the possibility of building a better system.
+
+## When should we use the Design Patterns?
+We must use the design patterns **during the analysis and requirement phase of SDLC (Software Development Life Cycle)**.
+
+Design patterns ease the analysis and requirement phase of SDLC by providing information based on prior hands-on experiences.
+
+## Categorization of Design Patterns
+Basically, design patterns are categorized into two parts:
+
+1. Core Java (or JSE) Design Patterns.
+2. JEE Design Patterns.
+
+## Core Java Design Patterns
+In core java, there are mainly three types of design patterns, which are further divided into their sub-parts:
+
+**1. Creational Design Pattern**
+
+  1. Factory Pattern
+  2. Abstract Factory Pattern
+  3. Singleton Pattern
+  4. Prototype Pattern
+  5. Builder Pattern
+
+**2. Structural Design Pattern**
+
+  1. Adapter Pattern
+  2. Bridge Pattern
+  3. Composite Pattern
+  4. Decorator Pattern
+  5. Facade Pattern
+  6. Flyweight Pattern
+  7. Proxy Pattern
+
+**3. Behavioral Design Pattern**
+
+  1. Chain Of Responsibility Pattern
+  2. Command Pattern
+  3. Interpreter Pattern
+  4. Iterator Pattern
+  5. Mediator Pattern
+  6. Memento Pattern
+  7. Observer Pattern
+  8. State Pattern
+  9. Strategy Pattern
+  10. Template Pattern
+  11. Visitor Pattern