The data
structure can only be accessed with defined operations.
This set of
operations is called interface and is exportedby the entity.
An entity with the properties just described is called
an abstract data
type (ADT).
•name
•date of birth
•social number
A well-defined entity which can be
properly handled
can be created. These entities define the data
structure of a set of items
Data structure
An ADT which consists of an
abstract data structure and operations. Only the operations are viewable from
the outside and define the interface.