Python Dictionary or “Dict” is an inbuilt data structure of Python that is used to store an unordered collection of elements. Unlike other Python data structures that store single values, the dictionary data structure stores key-value pairs where every key is unique. It does not remember the insertion order of key-value pairs and iterates through the keys. On the other hand, an Ordered Dictionary or OrderedDict keeps a track of the insertion order of key-value pairs. It also consumes more memory than a regular dictionary in Python due to its doubly linked list implementation. If you delete and re-insert the same key, it will be inserted in its original position as an OrderedDict remembers the insertion order.