Why Factory Design Pattern

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Factory design pattern is widely known design pattern and many people know exactly how to use it.
But when it comes to the question why factory design pattern then so many people really fail to explain the real reason why to use factory design pattern.
In this video i have tried to explain exactly that.
Please comment if you have any doubt I will definitely reply.

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Hello Sir, I wanted clear idea about where the library i.e. factory code part will reside, in a lib/dll or any other way?
How (without updating the app on user mobile) would the library(having factory code) link with the app which is already distributed to the users ?
TIA!

pallavichaudhary