Linked lists are a linear data structure consisting of nodes that are linked together in a sequence. Each node contains data and a pointer to the next node. There are three main types: singly linked lists where each node points to the next; doubly linked lists where each node points to both the next and previous nodes; and circular linked lists where the last node loops back to the first node. Linked lists are commonly used to implement stacks, queues, and graphs as they allow easy insertion and deletion of elements without needing to know the size in advance. They are more dynamic than arrays and have advantages for insertion/deletion and accessing stacks/queues.
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