👉 In computer science, a duplicate is a data structure that allows for efficient insertion and deletion of elements without altering the original order. For example, in a linked list, duplicates are added at both ends to maintain the linked list's circular nature. A duplicate can be represented as a node with two attributes: the value stored within it and a reference to its next element. When inserting or deleting an element, the node is moved to ensure that the original order of elements is preserved while maintaining the structure of