4. Difference Between a stack and a queue , what is a linked list.

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A stack is a data structure that follows Last-In-First-Out (LIFO) principle, while a queue follows First-In-First-Out (FIFO) principle. A linked list is a linear data structure where each element is a separate object with a pointer to the next element.

Stack is like a stack of plates, where the last plate added is the first one to be removed. Example: undo-redo functionality in a text editor.
Queue is like a queue of people waiting in line, where the first person added is the first one to be served. Example: print jobs in a printer queue.
Linked list is a collection of nodes, where each node contains data and a pointer to the next node. Example: implementation of a hash table.

4. Difference Between a stack and a queue , what is a linked list.

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