The `add_node` method in the `LinkedList` class of Python is used to add a new node to the linked list. It takes an input parameter, `data`, which represents the value to be stored in the new node. This method creates a new node with the given data, and links it to the existing nodes in the linked list, maintaining the order of the elements. The new node becomes the last node in the linked list, with its `next` pointer set to `None`.
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