This document discusses inserting a node into a linked list at the end. It explains that to insert a node at the end, you first check if the list is empty and if so make the new node the start. If the list is not empty, you iterate through the list with a pointer ptr until ptr->next is NULL, at which point you set ptr->next to the new node and new_node->next to NULL. Diagrams are included to visualize the process. The algorithm runs in O(n) time where n is the number of nodes in the list.