A. Definition/ Concept
♀According to Wikipedia page stack is container nodes and has two basic operations: push and pop. Push adds a given node to the top of the stack leaving previous nodes below. Pop removes and returns the current top node of the stack.
♀In computer science, a stack is an abstract data type and data structures based on the principle of Last in First Out. Example of this is, a modern Personal Computer uses stacks at the architecture level, which are used in the basic design of an operating system for interrupt handling and operating system function calls. ["Wikipedia"]
B. Illustration
Figure 1 illustration of the stack["Wikipedia"]
C. References
["WIKI"] http://en.wikipedia.org/wiki/Stack_(data_structure)
["WIKI"] http://en.wikipedia.org/wiki/File:Data_stack.svg
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