what are the oops concepts and explain them

There are four concepts of OOPs(Object Oriented Programming System):

• Inheritance
• Abstraction
• Encapsulation
• Polymorphism

Inheritance:
Process of Aquiring properties from one class to another without changes is known as Inheritance. In other word, the ability of a new class to be created, from an existing class by extending it, is called inheritance.

Abstraction:
Abstraction reduces complexity by hiding non essancial details and showing only essancial details.

Encapsulation:
Wrapping up of data and methods in to a single unit is called as encapsulation.
The encapsulation is mainly achieved by creating classes, the classes expose public methods and properties. A class is kind of a container or capsule or a cell, which encapsulate a set of methods, attribute and properties to provide its indented functionalities to other classes.

Polymorphism:
Polymorphisms is a generic term that means 'many forms'. More precisely Polymorphisms means the ability to request that the same operations be performed by a wide range of different types of things.
The polymorphisms is achieved by using many different techniques named method overloading, operator overloading, and method overriding.