In data abstraction, non-essential facts are concealed and only necessary ones are displayed to the user. 

Both abstract classes and interfaces are capable of achieving abstraction.

 

Abstraction By Abstract Class

• All methods and classes use the abstract keyword:
• An abstract class cannot be directly used to produce objects; instead, it can only be accessed via inheriting it from another class.
• Abstract method does not have a body and can only be used in abstract classes. Inheriting from a derived class provides the body.
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Abstraction Interface

Interfaces are another tool at C# abstraction. An interface is a completely “abstract class” that may only have abstract properties and methods:

An interface can only be accessed by classes that have "implemented" (or "inherited") it. Similar to inheritance, the : symbol is used to implement an interface. In the "implement" class, you'll find the actual interface method body.