oops can help to solve real world problem.

OOPS is useful to make design pattern, framework of real world problem.

What you got from others is known as Inheritance. Inheritance is like share properties between the Classes. For instance, a "fruit" is a generalization of "apple", "orange", "mango" and many others. One can consider fruit to be an abstraction of apple, orange, etc. Conversely, since apples are fruit (i.e., an apple is-a fruit), apples may naturally inherit all the properties common to all fruit, such as being a fleshy container for the seed of a plant. Inheritance is the main concept of object oriented programming language.. Inheritance means object of one class aquire the properties of another class.that's the base class is known as parent class and the secondary class is known as child class and child class can have some or all the functionality of parent class

specialization and generalization