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.
Both classes and modules are reference types that encapsulate the items defined within, but they differ in how items are accessed from other procedures. Differences Between Classes and Modules. The main difference between classes and modules is that classes can be instantiated as objects while standard modules cannot.