A circular linked list is a data structure that consists of a series of connected nodes, where each node points to the next one, forming a circle. Unlike a traditional linked list, the last node in a circular linked list points back to the first node instead of pointing to null. This allows for continuous traversal of the list without needing to start over. Circular linked lists can be singly or doubly linked. In a singly circular linked list, each node has a reference to the next node, while in a doubly circular linked list, each node has references to both the next and previous nodes. This structure is useful for applications that require a continuous loop through the data, such as in round-robin scheduling.