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A stack and a queue are both examples of abstract data types, mathematical models that define a system through its behaviors and properties. These abstract models can then be used to implement real data structures for use in computer systems.

Unlike other data types, the stack and queue do not support arbitrary access to each data element they contain. Instead, data is retrieved based on the order in which the data was inserted into the stack or queue.

A stack provides
Select Option first in, first outlast in, first out
data access. The first element to be inserted is the
Select Option firstlast
element to be removed. A queue provides
Select Option first in, first outlast in, first out
data access. The first element to be inserted is the
Select Option firstlast
element to be removed.
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