Next time you hit back in your browser or undo a mistake, remember, it’s Linked Lists in action.

Question

What powers your browser history, undo/redo in apps, or navigation between screens?

Behind the scenes → it’s the Linked List.

And there are two key types you should know: Singly and Doubly Linked List.

Singly Linked List (SLL):

Each node = data + next pointer

Can move forward only

Lightweight in memory (just one pointer)

Example: A planned route in a GPS application can be viewed as a singly linked list of instructions.

Doubly Linked List (DLL):

Each node = prev pointer + data + next pointer

Can move both forward and backward

Requires more memory (two pointers per node)

Example: Browser history or Undo/Redo in editors

Quick Comparison:

Traversal: SLL → one-way | DLL → two-way

Deletion: SLL = harder | DLL = easier if you have the node

Memory: SLL lighter | DLL heavier

Use cases: SLL for simple forward-only data | DLL for flexible operations

Next time you hit back in your browser or undo a mistake, remember, it’s Linked Lists in action.

What’s your favorite real world use case of linked lists?

Drop it in the comments ⬇️