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define classes and objects. how does they work?
 An object is a location in memory having a value and referenced by an identifier. An object can be a variable, function, or data structure. With the later introduction of object-oriented programming the same word, "object," refers to a particular instance of a class.

Objects are considered instances of classes. In common speech one refers to a file as a class, while the file is the object. A class defines properties and behaviour once, usually for multiple instantiations.


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