The Fission Theory: This theory proposes that the Moon was once part of the Earth and somehow separated from the Earth early in the history of the solar system.
This provides modular approach to programming. Classes. A class is a concept used in object oriented programming languages such as C++, PHP, and JAVA etc. Apart from holding data, a class is also used to hold functions. An object is an instant of a class. In case of variables, the type is the class whereas the variable is the object.
Difference between class and object. Many programmers still get confused by the difference between class and object. In object-oriented terminology, a Class is a template for Objects and every Object must belong to a Class. The terms Class and Object are related to one another and each term holds its own distinct meaning.