Have you ever clicked: Back Forward inside a browser? That feature works efficiently because the system can move in both directions. A Doubly Linked List provides exactly that capability. Unlike a Singly Linked List, every node knows: who comes next who came before 1. What is a Doubly Linked List? A Doubly Linked List is a collection of nodes where each node stores: data next pointer previous pointer Visual representation: null ← [10] ⇄ [20] ⇄ [30] → null This allows traversal in both directions. 2. Node Structure public class DNode { int data; DNode prev; DNode next; DNode(int data) { this.data = data; this.prev = null; this.next = null; } Enter fullscreen mode Exit fullscreen mode } What's New? Compared to a Singly Linked List: Node next; becomes DNode prev; DNode next; One extra pointer unlocks bidirectional navigation. 3. Insert at Head Idea Create a new node and make it the first node.…