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.
When you actually use that class to make a THING, this is what you make. A method is a bit of code that can be called when needed (often as part of an class, but not always) Here's an example: I write a class called Ball. In my main code, I then write a=Ball.new, b=Ball.new, c=Ball.new.
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.