A class could be used to create an object, such as a molecule in
chemistry. In the class definition, would be functions that could
describe how general molecules behave, look, etc. and then when the
class is called later, certain attributes such as the type of molecule
could be defined. If I am thinking about a class correctly, it could be
used to describe the behavior of a molecule for simulation, but then the
actual individual characteristics of the molecule could be called later.