A linked list is a data structure that consists of a group of nodes that together represent a sequence.
Each node is composed of a generic data element and a reference to the next node in the sequence.
There are several types of linked lists, but we'll begin by looking at the simplest - the singly-linked list.
A singly-linked list has only a NEXT pointer, which points to the next node in sequence. A doubly-linked list would have an additional PREV pointer that points to the previous node.
There is also a circular linked list, in which one next NEXT pointer points to a previous element.
The linking of a group of NODE objects is what gives us a linked list. Each NEXT pointer connects one node to the next. If the node is at the end, its NEXT pointer will point to NULL.
Additionally, there are two more pointers in a linked list. The HEAD of the linked list holds the first node in the list, while the TAIL holds the last.
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