Abstraction is the technique of hiding implementation. At it's core there's not much more to that answer. The bulk of meaning to abstraction come from how and why it is used.
It is used for the following scenarios
- Reduce complexity. (Create a simple interface)
- Allow for implementation to be modified without impacting its users.
- Create a common interface to support polymorphism (treating all implementations of the abstracted layer the same.
- Force users to extend the implementation rather than modify.
- Support cross platform by changing the implementation per platform.
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