In Python, which term refers to data that remains constant and cannot be changed?

The correct answer is that a tuple refers to data that remains constant and cannot be changed. In Python, a tuple is a collection of items that is ordered and unchangeable. Once a tuple is created, its elements cannot be modified, added, or removed. This is particularly useful when you want to ensure that your data remains consistent throughout the lifecycle of your program.

Tuples are defined by enclosing elements in parentheses, and they can contain mixed types (e.g., integers, strings, other tuples). The immutability of tuples makes them a valuable tool for various applications, such as serving as keys in dictionaries or ensuring that data is protected from modification.

In contrast, a variable is a reference that can hold data and can be changed at any time during the program's execution. Lists are mutable collections, meaning that their contents can be changed after creation (elements can be added or removed). Mutable objects refer to types of data, like lists and dictionaries, that can be modified. Thus, tuples stand out in Python for their role as immutable sequences, which is why they are identified as the correct answer to the question.