A node is an abstract basic unit used to build linked
data structures, such as
linked lists and
trees, and computer-based representation of
graphs. Nodes contain
data and/or links to other nodes. Links between nodes are often implemented by
pointers or
references.A node can be thought of as a logical placeholder for some data. It is a memory block which contains some data unit, and optionally a reference to some other data, which may be another node that contains some other data. By linking one node with other interlinked nodes, very large and complex data structures can be formed.
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