Concept of an Element (Node)
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A node is the unit of reference in a data structure. It is an abstract encapsulation structure that contains the data element that is held in the container (data structure). Also known as a vertex in graphs and trees.
A node may encapsulate a collection of information or a singular value which represents a single concept or object. A node is a referenced element commonly implemented using pointers, arrays, records, structs, file records (external storage), or even as a concept in a DBMS system.
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