Add content to the linked list

docs/linked-list.md

@@ -4,4 +4,36 @@ title: Linked list
 sidebar_label: Linked list
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-[Open a pull request](https://github.com/AllAlgorithms/algorithms/tree/master/docs/linked-list.md) to add the content for this algorithm.
+**A linked list** is a linear data structure where elements, called nodes, are stored in a sequence. Each node contains two parts:
+
+Data: The actual value or information stored in the node.
+Pointer (or Reference): A reference or pointer to the next node in the list.
+
+## Types of Linked Lists :
+
+There are several variations of linked lists:
+
+## Singly Linked List:
+
+Structure: Each node contains data and a pointer to the next node.
+Characteristics: Traversal is possible only in one direction (from the head to the tail).
+
+<img src="https://media.geeksforgeeks.org/wp-content/uploads/20240726165319/Singly-Linked-List.webp"/>
+
+
+
+## Doubly Linked List:
+
+Structure: Each node contains three parts—data, a pointer to the next node, and a pointer to the previous node.
+Characteristics: Traversal is possible in both directions (forward and backward).
+
+<img src="https://media.geeksforgeeks.org/wp-content/uploads/20240809123741/Insertion-at-the-End-in-Doubly-Linked-List-copy.webp"/>
+
+## Circular Linked List:
+
+Structure: Similar to a singly or doubly linked list, but the last node's next pointer refers to the first node instead of being null.
+Characteristics: No null references at the end; it forms a circular chain.
+In circular singly linked list: the last node points back to the head.
+In circular doubly linked list: both the first node's previous pointer and the last node's next pointer connect, forming a loop.
+
+<img src ="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRNLLQU9BmqL-7ME04qoAuQf60_bUBEn0tzdg&s"/>