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Class: A template for an object which contains variables and methods which can be inherited from other superclasses and whose calling sequence and existence can be defined by interfaces
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Object or Instance: A particular realization of some class; different instances usually have different values for their variables or instances but the same methods
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Simple types: variables defined by int, char etc. are NOT objects but each has an associated wrapper class which can be used with greater power but lower efficiency
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Superclass: A class further up in the inheritance tree
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Subclass: A class further down in the inheritance tree
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Abstract classes:contain abstract methods which are not implemented and only define interfaces. Subclasses will provide implementations
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