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What is the difference between a stack and a queue?

Q: What is the difference between a stack and a queue?

**Intuition.** Both are linear collections; they differ only in *which end you take from*. A **stack** is LIFO — last in, first out, like a pile of plates. A **queue** is FIFO — first in, first out, like a line at a counter. Stack (LIFO) <text x="120" y="172" fill="currentColor" f

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Stack and queue from a dynamic array

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from collections import deque

stack = []
stack.append(1); stack.append(2)   # push
print(stack.pop())                 # 2 (LIFO)

queue = deque()
queue.append(1); queue.append(2)   # enqueue
print(queue.popleft())             # 1 (FIFO)

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