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# Chapter 5.   Stack and Queue

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![Stack and Queue](../assets/covers/chapter_stack_and_queue.jpg){ class="cover-image" }

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!!! abstract

    A stack is like cats placed on top of each other, while a queue is like cats lined up one by one.
    
    They represent the logical relationships of Last-In-First-Out (LIFO) and First-In-First-Out (FIFO), respectively.

## Chapter Contents

- [5.1 &nbsp; Stack](https://www.hello-algo.com/en/chapter_stack_and_queue/stack/)
- [5.2 &nbsp; Queue](https://www.hello-algo.com/en/chapter_stack_and_queue/queue/)
- [5.3 &nbsp; Double-ended Queue](https://www.hello-algo.com/en/chapter_stack_and_queue/deque/)
- [5.4 &nbsp; Summary](https://www.hello-algo.com/en/chapter_stack_and_queue/summary/)