Which of the following statements is true about dictionaries in Python?

Dictionaries in Python are indeed mutable and allow for key-value pair mapping, which means that you can change their contents after they have been created. This mutability is a crucial characteristic, enabling developers to add, remove, or modify key-value pairs as needed in a program.

Moreover, dictionaries map unique keys to values, providing an efficient way to access data. You can think of a dictionary like a real-life dictionary where each word (the key) corresponds to a definition (the value). This key-value structure facilitates quick lookups, making dictionaries particularly useful for situations where you need to associate data with unique identifiers.

The other statements do not hold true for dictionaries: they do not maintain the order of items in the way you might expect (especially in versions prior to Python 3.7, where the order was guaranteed), they cannot have duplicate keys (each key must be unique), and they do not use numbered indices like lists do; instead, they utilize the keys for data retrieval. These distinctions highlight the unique role that dictionaries play in Python programming.