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The Complete Idiot's Guide® To iPad and iPhone App Development by Troy Brant

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Object-Oriented Programming Review

To program effectively in Objective-C, you need to have a pretty good idea of how object-oriented programming (OOP) works. Take a few moments to review the topics and terminology introduced below:
Class:Blueprint used to create objects. Also defines the type of the object.
Object: Specific allocation of a class. Can also be referred to as an instance.
Constructor:Method used to create an instance of a class. In Objective-C, constructors are often referred to as “initializers.”
Method: A function that an object knows how to perform. You have seen these referred to as “actions” in Interface Builder.
Instance Variable:A specific piece of data belonging to an instance. You have seen these referred to as ...

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