An abstract data type (ADT) defines a pen as a collection of related data items including type, brand, color, and price along with operations such as write. An ADT describes what data and operations are involved without specifying how they are implemented, focusing on the essential properties and behaviors. A data structure then provides the physical implementation of an ADT, realizing how the data and operations are structured and processed.

1. ADT : Abstract Data Type
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OBJECT
Pen
A definition for data type
A set of values(properties) and operations
Type
Brand
Color
Write()
Price
A collection of related data items together with an associated set of operations

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Write()
INPUT OUTPUT
class Pen
{
public:
int Type
String Brand
int Color
int Price
void Write()
}
ENCAPSULATION
Data Type : Independent of Implementation
Emphasis -> WHAT
Abstract -> HOW
Data Structure : Physical Implementation of an ADT

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Data Type