A linked list is a dynamic, linear data structure where elements are stored as nodes in non-contiguous memory locations, with each node holding both data and a reference (pointer) to the next node. Unlike arrays, linked lists enable efficient insertions and deletions without shifting elements, making them particularly suitable for scenarios with frequent modifications or unknown sizes. The trade-off is slower random access (requiring sequential traversal) compared to arrays, but for stacks, queues, and many algorithmic problems, this flexibility is often worth it—especially when you understand that the choice between linked lists and arrays isn't about pure speed, but about cache behavior, access patterns, and dynamic sizing needs.

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