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A LIFO (Last In, First Out) data structure.
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Why do we need a Heap if everything can be done much more efficiently on the Stack?
This is actually somewhat related to the question I asked yesterday about why both a Stack and a Heap are necessary in the applications we use today (and why we can't just go with a Heap instead of both … However, many of the responses indicated that a Stack is irreplaceable due to the fact that is many hundreds (or thousands) of times faster than trying to allocate/reference the Heap. …