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data abstraction
subject			fact

data abstraction	groups the pieces of data that describe some entity, so that programmers can manipulate that data as a unit
	helps a programmer to cope with the complexity of data
	hides the details of data
	is a subtopic of 2.1 - What is Object Orientation?
	is a kind of abstraction

Kinds of data abstraction :

• association (8 kinds, 22 facts) - A relationship between two classes that represents the existence of a set of links between objects of the two classes
• attribute (15 facts) - A simple data item present in all the instances of a class
• class (15 kinds, 28 facts) - A software module that provides both procedural and data abstraction. It describes a set of similar objects, called its instances
• data type (1 kind, 3 facts)
• interface (1 kind, 14 facts)
• link (7 facts) - A reference from one object to another
• record (2 facts)
• structure (2 facts)