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+Let's start with objects. An object is a
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+computing unit organized around a collection of state
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+or instance variables that define the state of
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+the object. In addition, each object has associated
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+with it a set operations or methods that
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+operate on such state. So what that means
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+is that operations and methods read and write
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+instance variables. And in traditional object orientation, we say
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+that operations are invoked by sending a message
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+to the appropriate object, which is what we call
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+normally a method implication. So now that we define
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+what an object is, state variables, or attributes, and
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+operations or methods, let's see what a class is.
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+A class is basically a template. A blueprint, if
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+you wish, from which new objects, which is what
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+we call instances of the class can be created.
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+And notice that the fact of having a blueprint for
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+objects that allows us to create as many objects as
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+we want can further reuse, and also contribute to make
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+the code more readable, understandable,
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+and therefore ultimately more maintainable.