What is abstraction? What are the different ways to achieve abstraction?

Abstraction is one of the characteristic features of Object Oriented Programming.
Abstraction enforces the rule that a component "exposes only which is required for the context".
This ensures a proper layer of view, where the client is provided with access to those features or contents of it which are needed for the moment.
In C#, abstraction is achieved in two ways: by the use of abstract classes and interfaces.
An abstract class is a class which can't be instantiated but is extended by its sub classes which create different versions of the functionality defined in the abstract class.
An interface is like a contract - it only contains a template of how the component would look like, and all its sub classes must implement the same design.
Abstract classes are used to create base functionality with a scope for further extension, while interfaces are created to use while interacting with other components without having to use concrete types that contain functionality.

Abstraction is one of the characteristic features of Object Oriented Programming.
Abstraction enforces the rule that a component "exposes only which is required for the context".
This ensures a proper layer of view, where the client is provided with access to those features or contents of it which are needed for the moment.
In C#, abstraction is achieved in two ways: by the use of abstract classes and interfaces.
An abstract class is a class which can’t be instantiated but is extended by its sub classes which create different versions of the functionality defined in the abstract class.
An interface is like a contract – it only contains a template of how the component would look like, and all its sub classes must implement the same design.
Abstract classes are used to create base functionality with a scope for further extension, while interfaces are created to use while interacting with other components without having to use concrete types that contain functionality.

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