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.
The definition of a function occurs in languages such as Pascal, JavaScript, and C, while a method is defined in object-oriented languages, with the most common being Java and C#. Functions are called independently while an instance or object is used to call methods.