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.
Let me explain the difference between the method and function. Method is used to for doing the things especially in a systematic way implies an orderly logical arrangement. The function is a self-contained block of statements that perform a coherent task of some kind.