What is a class inside a class?

Hi, Harshit Maybe those links could help you in your searching: https://www.geeksforgeeks.org/nested-classes-java/ https://docs.oracle.com/javase/tutorial/java/javaOO/nested.html Is possible define a class within another class, this concept is called, nested classes. The nested classes enable you to group classes that are only used in one place, it's kind of increases the use of Encapsulation. I will share another link to go deeper into Encapsulation: https://www.geeksforgeeks.org/encapsulation-in-java/ Best Regards