Class – defines the grouping of data and code, the “type” of an object
Instance – a specific allocation of a class
Message – sent to objects to make them act
Method – a “function” that an object knows how to perform
Instance Variables – a specific piece of data belonging to an object
Property – away to access instance variables and other attributes of an object
Encapsulation – keep implementation private and seperate from interface
Polymorphism – different objects, same interface
Inheritance – hierarchical organization. share code, customize or extend behaviors