A LinkedList is a data structure used to store a collection of elements, called nodes. Each node contains two parts: the data it holds and a reference (or pointer) to the next node in the sequence. This allows for efficient insertion and deletion of elements, as these operations do not require shifting other elements, unlike in an array. There are different types of linked lists, including singly linked lists, where each node points to the next one, and doubly linked lists, where nodes have pointers to both the next and previous nodes. This flexibility makes linked lists useful in various applications, such as implementing stacks, queues, and other complex data structures.