Design Pattern - It describes the problem, the solution, when to apply the solution, and
its consequences. It also gives implementation hints and examples. The solution
is a general arrangement of objects and classes that solve the problem. The
solution is customized and implemented to solve the problem in a particular
context.
1. Creational Patterns-class instantiation
2. Structural Patterns -Class and Object composition
3. Behavioral Patterns -Class's objects communication
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