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Elementary items constitute a unit and that unit may be considered as a structure.
.>> structure may be treated as a frame or proforma where we organize some elementary items in different ways.
Data structure is a structure or unit where we organize elementary data items in different ways.
>>That means, a data structure is a means of structural relationships of elementary data items for storing and retrieving data in computer’s memory.
Usually elementary data items are the elements of a data structure.
However, a data structure may be an element of another data structure. That means a data structure may contain another data structure

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