Design Patterns : general repeatable solution to common problems in software design ... it is a description or template for how to solve a problem that can be used in many situations

problems examples :

• create only one class instance
• create multiple instances of similar kind with loose coupling.
• abstract database actions from our logic

importance :

• speed up the development process by providing tested proven development paradigms
• making the overall system easier to understand and maintainable
• easy developers communication when discussing system design

	Design Patterns	Design Principles
provided guideline level	high level	low level
examples	Factory,Adaptor	SOLID,DRY,KISS

types :

• Creational : class-object instantiation or creation
• Structural : organizing diff classes-objects during forming larger complex structure providing new functionality
• Behavioral : communication bet objects

	Creational	Structural	Behavioral
Main Role	class-object instantiation or creation	organizing diff classes-objects during forming larger complex structure providing new functionality	communication bet objects