Encapsulation vs Abstraction

Encapsulation:-- Information(Data) hiding.
Encapsulation is used for hide the code and data in a single unit to protect the data from the outside the world. Class is the best example of encapsulation. As the name suggests, Encapsulation is "hide/enclose something".


Abstraction:-- Implementation hiding.
Abstraction refers to showing only the necessary details to the intended user. As the name suggests, abstraction is the "abstract form of anything".

class Foo{
    private int a, b;
    public Foo(){ }
    int add(){   
         return a+b;  
    }
}

Internal representation of any object of Foo class is hidden outside the class. --> Encapsulation.
Any accessible member (data/method) of an object of Foo is restricted and can only be accessed by that object only.

Implementation of method add() is hidden. --> Abstraction.

Implementation Difference Between Encapsulation and Abstraction

Abstraction is implemented using interface and abstract class while Encapsulation is implemented using private and protected access modifier.

 Real world example:-

Complex logic is in the circuit board which is encapsulated in a touchpad and a nice interface(buttons) is provided to abstract it out to the user.

So Abstraction is generalized term. i.e. Encapsulation is subset of Abstraction.