Linked list is the best data structure for implementing a queue.



Queue:
A queue is a linear data structure that follows the First-In-First-Out (FIFO) principle. It has two main operations: enqueue (insertion) and dequeue (deletion). The elements are inserted at the rear and removed from the front.


Arrays are fixed in size, and inserting or deleting an element in the middle of the array is inefficient. To maintain the FIFO order in a queue, elements need to be shifted every time an insertion or deletion is performed. This shifting operation is costly in terms of time complexity, making arrays less suitable for implementing a queue.


Linked lists consist of nodes, where each node contains data and a pointer to the next node. The nodes are not necessarily stored in contiguous memory locations. This dynamic structure allows for efficient insertion and deletion at both ends (head and tail) of the list.

Advantages of Linked List for Queue Implementation:
- Insertion (enqueue) and deletion (dequeue) operations can be performed in constant time O(1) at the beginning or end of the linked list.
- No shifting of elements is required, as in the case of an array.
- Linked lists can dynamically grow or shrink, making them suitable for a queue that may change in size frequently.

Implementation:
To implement a queue using a linked list, we can maintain two pointers: one pointing to the front of the queue (head) and another pointing to the rear (tail).
- Enqueue operation: Insert a new node at the tail of the linked list.
- Dequeue operation: Remove the node at the head of the linked list.

By using a linked list, we can efficiently implement the operations of a queue without the overhead of shifting elements, making it the best-suited data structure for a queue.