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What is Facade Pattern and why is it needed?

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Whst is Facade?
The facade pattern is a software design pattern commonly used with object-oriented programming.

Why it is needed?
It mostly reducs the dependencies of outside code on the inner workings of a library,thus allowing more flexibility in developing the system. And provide simpler interface to clients.

There are other design patterns as well like Bridge Pattern, Proxy Pattern etc.

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