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* stacks are **last in, first out** (LIFO) abstract structures, where the newest element is first one to be removed from the structure.
* a stack support `push` and `pop` at `O(1)`, and they be implmented with arrays or singly linked list.
* a stack support `push` and `pop` at `O(1)`, and they be implemented with arrays or singly linked list.
* stacks are useful in **depth-first search** algorithms, where you can push temp data as you recurse, and remove them from the (memory or data structure) stack as you backtrace.